20902218 has 16 divisors (see below), whose sum is σ = 41890656. Its totient is φ = 6953040.

The previous prime is 20902181. The next prime is 20902237. The reversal of 20902218 is 81220902.

It is a Curzon number.

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, 193 + ... + 6468.

It is an arithmetic number, because the mean of its divisors is an integer number (2618166).

Almost surely, 2^20902218 is an apocalyptic number.

20902218 is an abundant number, since it is smaller than the sum of its proper divisors (20988438).

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

20902218 is a wasteful number, since it uses less digits than its factorization.

20902218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7189.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 20902218 is about 4571.8943557348. The cubic root of 20902218 is about 275.4635399811.

The spelling of 20902218 in words is "twenty million, nine hundred two thousand, two hundred eighteen".