Properties of the Number 3220

Three Thousand Two Hundred Twenty

Basics

Value: 3219 → 3220 → 3221

Parity: even

Prime: No

Previous Prime: 3217

Next Prime: 3221

Digit Sum: 7

Digital Root: 7

Palindrome: No

Factorization: 2 ² × 5 × 7 × 23

Divisors: 1, 2, 4, 5, 7, 10, 14, 20, 23, 28

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110010010100

Octal: 6224

Duodecimal: 1A44

Hexadecimal: c94

Square: 10368400

Square Root: 56.74504383644443

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

Second 10-gonal (or decagonal) numbers: n*(4·n+3). A33954

Multiples of 20 containing a 20 in their decimal representation. A121040

a(n) is the difference between multiples of 5 with even and odd digit sum in base 4 in interval [0,4ⁿ). A212500

Number of integer partitions of n whose length cannot be written as a nonnegative linear combination of the distinct parts. A367219

Triangle read by rows: T(n, m) = number of forests with n nodes and m labeled trees. Also number of forests with exactly n - m edges on n labeled nodes. A105599

Triangle read by rows: T(n, k) is the number of forests on n labeled nodes with k edges. T(n, k) for n >= 1 and 0 <= k <= n-1. A138464

Numbers m such that 6·m+1 is a perfect square. A62717

Multiples of 7 whose sum of digits is equal to 7. A63416

a(n) = n*(8·n+1). A139275

Expansion of ∏_k>=1 1/(1-x^3·k-1)^k. A262876