20472713825 has 6 divisors (see below), whose sum is σ = 25386165174. Its totient is φ = 16378171040.

The previous prime is 20472713809. The next prime is 20472713851. The reversal of 20472713825 is 52831727402.

It can be written as a sum of positive squares in 3 ways, for example, as 48874081 + 20423839744 = 6991^2 + 142912^2 .

It is not a de Polignac number, because 20472713825 - 2⁴ = 20472713809 is a prime.

It is a super-2 number, since 2×20472713825² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 409454252 + ... + 409454301.

It is an arithmetic number, because the mean of its divisors is an integer number (4231027529).

Almost surely, 2^20472713825 is an apocalyptic number.

20472713825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20472713825 is a deficient number, since it is larger than the sum of its proper divisors (4913451349).

20472713825 is an equidigital number, since it uses as much as digits as its factorization.

20472713825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818908563 (or 818908558 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 41.

The spelling of 20472713825 in words is "twenty billion, four hundred seventy-two million, seven hundred thirteen thousand, eight hundred twenty-five".