20942256 has 40 divisors (see below), whose sum is σ = 56950720. Its totient is φ = 6613056.

The previous prime is 20942239. The next prime is 20942287. The reversal of 20942256 is 65224902.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10570 + ... + 12393.

It is an arithmetic number, because the mean of its divisors is an integer number (1423768).

Almost surely, 2^20942256 is an apocalyptic number.

It is an amenable number.

20942256 is an abundant number, since it is smaller than the sum of its proper divisors (36008464).

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

20942256 is a wasteful number, since it uses less digits than its factorization.

20942256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22993 (or 22987 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 20942256 is about 4576.2709709981. The cubic root of 20942256 is about 275.6393103979.

The spelling of 20942256 in words is "twenty million, nine hundred forty-two thousand, two hundred fifty-six".