20404918984 has 96 divisors (see below), whose sum is σ = 42236323200. Its totient is φ = 9228764160.

The previous prime is 20404918949. The next prime is 20404918987. The reversal of 20404918984 is 48981940402.

It is not an unprimeable number, because it can be changed into a prime (20404918987) 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, 18169447 + ... + 18170569.

It is an arithmetic number, because the mean of its divisors is an integer number (439961700).

Almost surely, 2^20404918984 is an apocalyptic number.

It is an amenable number.

20404918984 is an abundant number, since it is smaller than the sum of its proper divisors (21831404216).

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

20404918984 is a wasteful number, since it uses less digits than its factorization.

20404918984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1463 (or 1442 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 49.

The spelling of 20404918984 in words is "twenty billion, four hundred four million, nine hundred eighteen thousand, nine hundred eighty-four".