20118858 has 16 divisors (see below), whose sum is σ = 40295136. Its totient is φ = 6696720.

The previous prime is 20118841. The next prime is 20118869. The reversal of 20118858 is 85881102.

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, 3153 + ... + 7083.

It is an arithmetic number, because the mean of its divisors is an integer number (2518446).

Almost surely, 2^20118858 is an apocalyptic number.

20118858 is an abundant number, since it is smaller than the sum of its proper divisors (20176278).

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

20118858 is a wasteful number, since it uses less digits than its factorization.

20118858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4789.

The product of its (nonzero) digits is 5120, while the sum is 33.

The square root of 20118858 is about 4485.4049984366. The cubic root of 20118858 is about 271.9784170447.

The spelling of 20118858 in words is "twenty million, one hundred eighteen thousand, eight hundred fifty-eight".