20151256 has 16 divisors (see below), whose sum is σ = 40006440. Its totient is φ = 9482880.

The previous prime is 20151251. The next prime is 20151277. The reversal of 20151256 is 65215102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20151251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73950 + ... + 74221.

Almost surely, 2^20151256 is an apocalyptic number.

It is an amenable number.

20151256 is a deficient number, since it is larger than the sum of its proper divisors (19855184).

20151256 is a wasteful number, since it uses less digits than its factorization.

20151256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148194 (or 148190 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 20151256 is about 4489.0150367313. The cubic root of 20151256 is about 272.1243304152.

Adding to 20151256 its reverse (65215102), we get a palindrome (85366358).

The spelling of 20151256 in words is "twenty million, one hundred fifty-one thousand, two hundred fifty-six".