20464256 has 64 divisors (see below), whose sum is σ = 43605000. Its totient is φ = 9547776.

The previous prime is 20464237. The next prime is 20464267. The reversal of 20464256 is 65246402.

It can be written as a sum of positive squares in 4 ways, for example, as 17774656 + 2689600 = 4216^2 + 1640^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (29).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137270 + ... + 137418.

Almost surely, 2^20464256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20464256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21802500).

20464256 is an abundant number, since it is smaller than the sum of its proper divisors (23140744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20464256 is a wasteful number, since it uses less digits than its factorization.

20464256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229 (or 217 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 20464256 is about 4523.7435824768. The cubic root of 20464256 is about 273.5260244813.

The spelling of 20464256 in words is "twenty million, four hundred sixty-four thousand, two hundred fifty-six".