21790854 has 24 divisors (see below), whose sum is σ = 48491040. Its totient is φ = 7067088.

The previous prime is 21790843. The next prime is 21790921. The reversal of 21790854 is 45809712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15694 + ... + 17025.

It is an arithmetic number, because the mean of its divisors is an integer number (2020460).

Almost surely, 2^21790854 is an apocalyptic number.

21790854 is an abundant number, since it is smaller than the sum of its proper divisors (26700186).

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

21790854 is a wasteful number, since it uses less digits than its factorization.

21790854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32764 (or 32761 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 21790854 is about 4668.0674802320. The cubic root of 21790854 is about 279.3131720604.

The spelling of 21790854 in words is "twenty-one million, seven hundred ninety thousand, eight hundred fifty-four".