20807773968 has 80 divisors (see below), whose sum is σ = 56972889216. Its totient is φ = 6521333760.

The previous prime is 20807773933. The next prime is 20807773999. The reversal of 20807773968 is 86937770802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 828930 + ... + 853662.

Almost surely, 2^20807773968 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20807773968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28486444608).

20807773968 is an abundant number, since it is smaller than the sum of its proper divisors (36165115248).

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

20807773968 is a wasteful number, since it uses less digits than its factorization.

20807773968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25792 (or 25786 counting only the distinct ones).

The product of its (nonzero) digits is 7112448, while the sum is 57.

The spelling of 20807773968 in words is "twenty billion, eight hundred seven million, seven hundred seventy-three thousand, nine hundred sixty-eight".