20497256 has 16 divisors (see below), whose sum is σ = 41388900. Its totient is φ = 9460224.

The previous prime is 20497247. The next prime is 20497271. The reversal of 20497256 is 65279402.

It can be written as a sum of positive squares in 2 ways, for example, as 19624900 + 872356 = 4430^2 + 934^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98441 + ... + 98648.

Almost surely, 2^20497256 is an apocalyptic number.

20497256 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20497256 is an abundant number, since it is smaller than the sum of its proper divisors (20891644).

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

20497256 is a wasteful number, since it uses less digits than its factorization.

20497256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197108 (or 197104 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 20497256 is about 4527.3895348203. The cubic root of 20497256 is about 273.6729719407.

The spelling of 20497256 in words is "twenty million, four hundred ninety-seven thousand, two hundred fifty-six".