20680560978 has 32 divisors (see below), whose sum is σ = 51567114240. Its totient is φ = 5371574160.

The previous prime is 20680560961. The next prime is 20680561009. The reversal of 20680560978 is 87906508602.

It is a self number, because there is not a number n which added to its sum of digits gives 20680560978.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22381098 + ... + 22382021.

It is an arithmetic number, because the mean of its divisors is an integer number (1611472320).

Almost surely, 2^20680560978 is an apocalyptic number.

20680560978 is an abundant number, since it is smaller than the sum of its proper divisors (30886553262).

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

20680560978 is a wasteful number, since it uses less digits than its factorization.

20680560978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44763142.

The product of its (nonzero) digits is 1451520, while the sum is 51.

The spelling of 20680560978 in words is "twenty billion, six hundred eighty million, five hundred sixty thousand, nine hundred seventy-eight".