20031873156 has 63 divisors (see below), whose sum is σ = 52579684213. Its totient is φ = 6674743440.

The previous prime is 20031873139. The next prime is 20031873217. The reversal of 20031873156 is 65137813002.

The square root of 20031873156 is 141534.

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

20031873156 is a `hidden beast` number, since 20 + 0 + 318 + 7 + 315 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16503513156 + 3528360000 = 128466^2 + 59400^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

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 20031873156.

It is an unprimeable number.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 7641526 + ... + 7644146.

Almost surely, 2^20031873156 is an apocalyptic number.

20031873156 is the 141534-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20031873156

20031873156 is an abundant number, since it is smaller than the sum of its proper divisors (32547811057).

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

20031873156 is an frugal number, since it uses more digits than its factorization.

20031873156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5264 (or 2626 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

Multiplying 20031873156 by its sum of digits (36), we get a square (721147433616 = 849204²).

20031873156 divided by its sum of digits (36) gives a square (556440921 = 23589²).

The spelling of 20031873156 in words is "twenty billion, thirty-one million, eight hundred seventy-three thousand, one hundred fifty-six".