20718371590 has 48 divisors (see below), whose sum is σ = 45665002800. Its totient is φ = 6729573312.

The previous prime is 20718371567. The next prime is 20718371629. The reversal of 20718371590 is 9517381702.

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, 1103385 + ... + 1122004.

It is an arithmetic number, because the mean of its divisors is an integer number (951354225).

Almost surely, 2^20718371590 is an apocalyptic number.

20718371590 is an abundant number, since it is smaller than the sum of its proper divisors (24946631210).

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

20718371590 is a wasteful number, since it uses less digits than its factorization.

20718371590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2225429 (or 2225422 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 43.

The spelling of 20718371590 in words is "twenty billion, seven hundred eighteen million, three hundred seventy-one thousand, five hundred ninety".