20215005858 has 12 divisors (see below), whose sum is σ = 43799179398. Its totient is φ = 6738335280.

The previous prime is 20215005793. The next prime is 20215005887. The reversal of 20215005858 is 85850051202.

20215005858 is a `hidden beast` number, since 2 + 0 + 21 + 50 + 0 + 585 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19711317609 + 503688249 = 140397^2 + 22443^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 561527923 + ... + 561527958.

Almost surely, 2^20215005858 is an apocalyptic number.

20215005858 is an abundant number, since it is smaller than the sum of its proper divisors (23584173540).

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

20215005858 is a wasteful number, since it uses less digits than its factorization.

20215005858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1123055889 (or 1123055886 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 36.

The spelling of 20215005858 in words is "twenty billion, two hundred fifteen million, five thousand, eight hundred fifty-eight".