20372505978 has 48 divisors (see below), whose sum is σ = 45738806400. Its totient is φ = 6042125760.

The previous prime is 20372505977. The next prime is 20372505997. The reversal of 20372505978 is 87950527302.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20372505973) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 264403 + ... + 332646.

It is an arithmetic number, because the mean of its divisors is an integer number (952891800).

Almost surely, 2^20372505978 is an apocalyptic number.

20372505978 is an abundant number, since it is smaller than the sum of its proper divisors (25366300422).

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

20372505978 is a wasteful number, since it uses less digits than its factorization.

20372505978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 597123 (or 597112 counting only the distinct ones).

The product of its (nonzero) digits is 1058400, while the sum is 48.

The spelling of 20372505978 in words is "twenty billion, three hundred seventy-two million, five hundred five thousand, nine hundred seventy-eight".