20922818 has 16 divisors (see below), whose sum is σ = 37977984. Its totient is φ = 8439360.

The previous prime is 20922787. The next prime is 20922821. The reversal of 20922818 is 81822902.

It is a super-2 number, since 2×20922818² = 875528626122248, which contains 22 as substring.

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, 43718 + ... + 44193.

It is an arithmetic number, because the mean of its divisors is an integer number (2373624).

Almost surely, 2^20922818 is an apocalyptic number.

20922818 is a deficient number, since it is larger than the sum of its proper divisors (17055166).

20922818 is a wasteful number, since it uses less digits than its factorization.

20922818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87937.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 20922818 is about 4574.1466963796. The cubic root of 20922818 is about 275.5540038380.

The spelling of 20922818 in words is "twenty million, nine hundred twenty-two thousand, eight hundred eighteen".