20508657360 has 160 divisors (see below), whose sum is σ = 65271000960. Its totient is φ = 5324089344.

The previous prime is 20508657269. The next prime is 20508657419. The reversal of 20508657360 is 6375680502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3268306 + ... + 3274574.

It is an arithmetic number, because the mean of its divisors is an integer number (407943756).

Almost surely, 2^20508657360 is an apocalyptic number.

20508657360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20508657360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32635500480).

20508657360 is an abundant number, since it is smaller than the sum of its proper divisors (44762343600).

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

20508657360 is a wasteful number, since it uses less digits than its factorization.

20508657360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6645 (or 6639 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 42.

The spelling of 20508657360 in words is "twenty billion, five hundred eight million, six hundred fifty-seven thousand, three hundred sixty".