20881256 has 16 divisors (see below), whose sum is σ = 42711840. Its totient is φ = 9491440.

The previous prime is 20881241. The next prime is 20881271. The reversal of 20881256 is 65218802.

It is an interprime number because it is at equal distance from previous prime (20881241) and next prime (20881271).

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, 118556 + ... + 118731.

It is an arithmetic number, because the mean of its divisors is an integer number (2669490).

Almost surely, 2^20881256 is an apocalyptic number.

It is an amenable number.

20881256 is an abundant number, since it is smaller than the sum of its proper divisors (21830584).

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

20881256 is a wasteful number, since it uses less digits than its factorization.

20881256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237304 (or 237300 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 20881256 is about 4569.6012955180. The cubic root of 20881256 is about 275.3714253857.

The spelling of 20881256 in words is "twenty million, eight hundred eighty-one thousand, two hundred fifty-six".