20612112640 has 108 divisors (see below), whose sum is σ = 57433434156. Its totient is φ = 7066988544.

The previous prime is 20612112637. The next prime is 20612112641. The reversal of 20612112640 is 4621121602.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13593694464 + 7018418176 = 116592^2 + 83776^2 .

It is not an unprimeable number, because it can be changed into a prime (20612112641) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 101599 + ... + 227038.

It is an arithmetic number, because the mean of its divisors is an integer number (531791057).

Almost surely, 2^20612112640 is an apocalyptic number.

20612112640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20612112640 is an abundant number, since it is smaller than the sum of its proper divisors (36821321516).

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

20612112640 is an equidigital number, since it uses as much as digits as its factorization.

20612112640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328672 (or 328651 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The spelling of 20612112640 in words is "twenty billion, six hundred twelve million, one hundred twelve thousand, six hundred forty".