20504247972 has 48 divisors (see below), whose sum is σ = 51543750720. Its totient is φ = 6306519168.

The previous prime is 20504247941. The next prime is 20504247977. The reversal of 20504247972 is 27974240502.

It is a super-2 number, since 2×20504247972² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20504247977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 394054 + ... + 443042.

It is an arithmetic number, because the mean of its divisors is an integer number (1073828140).

Almost surely, 2^20504247972 is an apocalyptic number.

It is an amenable number.

20504247972 is an abundant number, since it is smaller than the sum of its proper divisors (31039502748).

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

20504247972 is a wasteful number, since it uses less digits than its factorization.

20504247972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51692 (or 51690 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 42.

The spelling of 20504247972 in words is "twenty billion, five hundred four million, two hundred forty-seven thousand, nine hundred seventy-two".