20908158 has 16 divisors (see below), whose sum is σ = 42001680. Its totient is φ = 6938496.

The previous prime is 20908157. The next prime is 20908163. The reversal of 20908158 is 85180902.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20908157) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6235 + ... + 8982.

It is an arithmetic number, because the mean of its divisors is an integer number (2625105).

Almost surely, 2^20908158 is an apocalyptic number.

20908158 is an abundant number, since it is smaller than the sum of its proper divisors (21093522).

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

20908158 is a wasteful number, since it uses less digits than its factorization.

20908158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15451.

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 20908158 is about 4572.5439308989. The cubic root of 20908158 is about 275.4896312864.

The spelling of 20908158 in words is "twenty million, nine hundred eight thousand, one hundred fifty-eight".