20922555 has 16 divisors (see below), whose sum is σ = 33606144. Its totient is φ = 11115360.

The previous prime is 20922547. The next prime is 20922581. The reversal of 20922555 is 55522902.

It is not a de Polignac number, because 20922555 - 2³ = 20922547 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1492 + ... + 6638.

It is an arithmetic number, because the mean of its divisors is an integer number (2100384).

Almost surely, 2^20922555 is an apocalyptic number.

20922555 is a deficient number, since it is larger than the sum of its proper divisors (12683589).

20922555 is a wasteful number, since it uses less digits than its factorization.

20922555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5426.

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 20922555 is about 4574.1179477578. The cubic root of 20922555 is about 275.5528492612.

The spelling of 20922555 in words is "twenty million, nine hundred twenty-two thousand, five hundred fifty-five".