20907036864 has 168 divisors, whose sum is σ = 70696823808. Its totient is φ = 5780712960.

The previous prime is 20907036853. The next prime is 20907036877. The reversal of 20907036864 is 46863070902.

It is a tau number, because it is divible by the number of its divisors (168).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

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, 41359 + ... + 208625.

Almost surely, 2^20907036864 is an apocalyptic number.

20907036864 is a gapful number since it is divisible by the number (24) 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 20907036864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35348411904).

20907036864 is an abundant number, since it is smaller than the sum of its proper divisors (49789786944).

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

20907036864 is a wasteful number, since it uses less digits than its factorization.

20907036864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167323 (or 167310 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The spelling of 20907036864 in words is "twenty billion, nine hundred seven million, thirty-six thousand, eight hundred sixty-four".