20989634884 has 27 divisors (see below), whose sum is σ = 37133207293. Its totient is φ = 10381377968.

The previous prime is 20989634779. The next prime is 20989634927. The reversal of 20989634884 is 48843698902.

The square root of 20989634884 is 144878.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 20865802500 + 123832384 = 144450^2 + 11128^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 31003554 + ... + 31004230.

Almost surely, 2^20989634884 is an apocalyptic number.

20989634884 is the 144878-th square number.

It is an amenable number.

20989634884 is a deficient number, since it is larger than the sum of its proper divisors (16143572409).

20989634884 is an frugal number, since it uses more digits than its factorization.

20989634884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1572 (or 786 counting only the distinct ones).

The product of its (nonzero) digits is 23887872, while the sum is 61.

The spelling of 20989634884 in words is "twenty billion, nine hundred eighty-nine million, six hundred thirty-four thousand, eight hundred eighty-four".