20996589604 has 27 divisors (see below), whose sum is σ = 37477812337. Its totient is φ = 10292678864.

The previous prime is 20996589587. The next prime is 20996589611. The reversal of 20996589604 is 40698569902.

The square root of 20996589604 is 144902.

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., 15136380900 + 5860208704 = 123030^2 + 76552^2 .

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, 15358929 + ... + 15360295.

Almost surely, 2^20996589604 is an apocalyptic number.

20996589604 is the 144902-nd square number.

It is an amenable number.

20996589604 is a deficient number, since it is larger than the sum of its proper divisors (16481222733).

20996589604 is an frugal number, since it uses more digits than its factorization.

20996589604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2844 (or 1422 counting only the distinct ones).

The product of its (nonzero) digits is 8398080, while the sum is 58.

The spelling of 20996589604 in words is "twenty billion, nine hundred ninety-six million, five hundred eighty-nine thousand, six hundred four".