20009256 has 16 divisors (see below), whose sum is σ = 50023200. Its totient is φ = 6669744.

The previous prime is 20009243. The next prime is 20009273. The reversal of 20009256 is 65290002.

It is a super-3 number, since 3×20009256³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 833719 = 20009256 / (2 + 0 + 0 + 0 + 9 + 2 + 5 + 6).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 416836 + ... + 416883.

It is an arithmetic number, because the mean of its divisors is an integer number (3126450).

Almost surely, 2^20009256 is an apocalyptic number.

It is an amenable number.

20009256 is an abundant number, since it is smaller than the sum of its proper divisors (30013944).

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

20009256 is a wasteful number, since it uses less digits than its factorization.

20009256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833728 (or 833724 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 20009256 is about 4473.1706875549. The cubic root of 20009256 is about 271.4836296171.

Adding to 20009256 its reverse (65290002), we get a palindrome (85299258).

The spelling of 20009256 in words is "twenty million, nine thousand, two hundred fifty-six".