20442856 has 32 divisors (see below), whose sum is σ = 44029440. Its totient is φ = 8716608.

The previous prime is 20442853. The next prime is 20442871. The reversal of 20442856 is 65824402.

It is a super-2 number, since 2×20442856² = 835820722873472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20442853) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11670 + ... + 13306.

It is an arithmetic number, because the mean of its divisors is an integer number (1375920).

Almost surely, 2^20442856 is an apocalyptic number.

It is an amenable number.

20442856 is an abundant number, since it is smaller than the sum of its proper divisors (23586584).

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

20442856 is a wasteful number, since it uses less digits than its factorization.

20442856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1873 (or 1869 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 31.

The square root of 20442856 is about 4521.3776661544. The cubic root of 20442856 is about 273.4306468225.

It can be divided in two parts, 2044 and 2856, that added together give a square (4900 = 70²).

The spelling of 20442856 in words is "twenty million, four hundred forty-two thousand, eight hundred fifty-six".