20900157 has 16 divisors (see below), whose sum is σ = 29616192. Its totient is φ = 13064960.

The previous prime is 20900149. The next prime is 20900177. The reversal of 20900157 is 75100902.

It is a cyclic number.

It is not a de Polignac number, because 20900157 - 2³ = 20900149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20900177) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17107 + ... + 18287.

It is an arithmetic number, because the mean of its divisors is an integer number (1851012).

Almost surely, 2^20900157 is an apocalyptic number.

It is an amenable number.

20900157 is a deficient number, since it is larger than the sum of its proper divisors (8716035).

20900157 is a wasteful number, since it uses less digits than its factorization.

20900157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1548.

The product of its (nonzero) digits is 630, while the sum is 24.

The square root of 20900157 is about 4571.6689512693. The cubic root of 20900157 is about 275.4544859337.

The spelling of 20900157 in words is "twenty million, nine hundred thousand, one hundred fifty-seven".