20638770244 has 27 divisors (see below), whose sum is σ = 36507642717. Its totient is φ = 10209196368.

The previous prime is 20638770233. The next prime is 20638770259. The reversal of 20638770244 is 44207783602.

The square root of 20638770244 is 143662.

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., 14385123844 + 6253646400 = 119938^2 + 79080^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20638770244.

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, 31317987 + ... + 31318645.

Almost surely, 2^20638770244 is an apocalyptic number.

20638770244 is the 143662-nd square number.

It is an amenable number.

20638770244 is a deficient number, since it is larger than the sum of its proper divisors (15868872473).

20638770244 is an frugal number, since it uses more digits than its factorization.

20638770244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1540 (or 770 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 43.

The spelling of 20638770244 in words is "twenty billion, six hundred thirty-eight million, seven hundred seventy thousand, two hundred forty-four".