20729312325 has 36 divisors (see below), whose sum is σ = 37136603140. Its totient is φ = 11053221120.

The previous prime is 20729312309. The next prime is 20729312381. The reversal of 20729312325 is 52321392702.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 497379204 + 20231933121 = 22302^2 + 142239^2 .

It is not a de Polignac number, because 20729312325 - 2⁴ = 20729312309 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20729312325.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1584009 + ... + 1597041.

Almost surely, 2^20729312325 is an apocalyptic number.

20729312325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20729312325 is a deficient number, since it is larger than the sum of its proper divisors (16407290815).

20729312325 is a wasteful number, since it uses less digits than its factorization.

20729312325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20118 (or 20110 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The spelling of 20729312325 in words is "twenty billion, seven hundred twenty-nine million, three hundred twelve thousand, three hundred twenty-five".