20431271844 has 63 divisors (see below), whose sum is σ = 53627825307. Its totient is φ = 6807851064.

The previous prime is 20431271797. The next prime is 20431271879. The reversal of 20431271844 is 44817213402.

The square root of 20431271844 is 142938.

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

20431271844 is a `hidden beast` number, since 20 + 431 + 27 + 184 + 4 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 20431271799 and 20431271808.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 7717329 + ... + 7719975.

Almost surely, 2^20431271844 is an apocalyptic number.

20431271844 is the 142938-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20431271844

20431271844 is an abundant number, since it is smaller than the sum of its proper divisors (33196553463).

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

20431271844 is an frugal number, since it uses more digits than its factorization.

20431271844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5316 (or 2652 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 36.

Multiplying 20431271844 by its sum of digits (36), we get a square (735525786384 = 857628²).

20431271844 divided by its sum of digits (36) gives a square (567535329 = 23823²).

The spelling of 20431271844 in words is "twenty billion, four hundred thirty-one million, two hundred seventy-one thousand, eight hundred forty-four".