20357688990 has 32 divisors (see below), whose sum is σ = 49215094560. Its totient is φ = 5389090304.

The previous prime is 20357688983. The next prime is 20357689003. The reversal of 20357688990 is 9988675302.

It is a self number, because there is not a number n which added to its sum of digits gives 20357688990.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2472495 + ... + 2480714.

It is an arithmetic number, because the mean of its divisors is an integer number (1537971705).

Almost surely, 2^20357688990 is an apocalyptic number.

20357688990 is an abundant number, since it is smaller than the sum of its proper divisors (28857405570).

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

20357688990 is a wasteful number, since it uses less digits than its factorization.

20357688990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4953356.

The product of its (nonzero) digits is 6531840, while the sum is 57.

The spelling of 20357688990 in words is "twenty billion, three hundred fifty-seven million, six hundred eighty-eight thousand, nine hundred ninety".