20857108558 has 48 divisors (see below), whose sum is σ = 37092425328. Its totient is φ = 8737344000.

The previous prime is 20857108541. The next prime is 20857108567. The reversal of 20857108558 is 85580175802.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2112333 + ... + 2122183.

It is an arithmetic number, because the mean of its divisors is an integer number (772758861).

Almost surely, 2^20857108558 is an apocalyptic number.

20857108558 is a deficient number, since it is larger than the sum of its proper divisors (16235316770).

20857108558 is a wasteful number, since it uses less digits than its factorization.

20857108558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10561 (or 10550 counting only the distinct ones).

The product of its (nonzero) digits is 896000, while the sum is 49.

The spelling of 20857108558 in words is "twenty billion, eight hundred fifty-seven million, one hundred eight thousand, five hundred fifty-eight".