20689370244 has 135 divisors (see below), whose sum is σ = 55410247893. Its totient is φ = 6731618400.

The previous prime is 20689370231. The next prime is 20689370357. The reversal of 20689370244 is 44207398602.

The square root of 20689370244 is 143838.

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., 672779844 + 20016590400 = 25938^2 + 141480^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20689370244.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 157934059 + ... + 157934189.

Almost surely, 2^20689370244 is an apocalyptic number.

20689370244 is the 143838-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20689370244

20689370244 is an abundant number, since it is smaller than the sum of its proper divisors (34720877649).

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

20689370244 is an equidigital number, since it uses as much as digits as its factorization.

20689370244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400 (or 197 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The spelling of 20689370244 in words is "twenty billion, six hundred eighty-nine million, three hundred seventy thousand, two hundred forty-four".