Properties of the Number 20074

Twenty Thousand Seventy-Four

Basics

Value: 20073 → 20074 → 20075

Parity: even

Prime: No

Previous Prime: 20071

Next Prime: 20089

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 2 × 10037

Divisors: 1, 2, 10037, 20074

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100111001101010

Octal: 47152

Duodecimal: B74A

Hexadecimal: 4e6a

Square: 402965476

Square Root: 141.6827441857335

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Total number of line segments between points visible to each other in a square n X n lattice. A141255

Number T(n,k) of set partitions of [n] having exactly k pairs (m,m+1) such that m+1 is in some block b and m is in block b+1; triangle T(n,k), n>=0, 0<=k<=n-floor((1+sqrt(max(0,8n-7)))/2), read by rows. A270953

Number of partitions of n with exactly four part sizes. A365630

Number of connected outerplanar graphs on n unlabeled nodes. A111563

Indices of records in A347113. A347308

Number of set partitions of [n] having exactly five pairs (m,m+1) such that m+1 is in some block b and m is in block b+1. A270959

a(n) = ∑_{-n<i<n, -n<j<n, gcd{i,j}=2} (n-|i|)*(n-|j|)/8. A331773

Index of first occurrence of n in A348179, or -1 if n never appears. A349423

a(n) = ∑_{k=0..floor((2·n+1)/5)} binomial(2·k+1,2·n-5·k+1). A392487

Numbers k such that 7·10^k + 4·R_k + 5 is prime, where R_k = 11...1 is the repunit (A002275) of length k. A103059