20831645325 has 12 divisors (see below), whose sum is σ = 34441653728. Its totient is φ = 11110210800.

The previous prime is 20831645321. The next prime is 20831645381. The reversal of 20831645325 is 52354613802.

It is a happy number.

It is not a de Polignac number, because 20831645325 - 2² = 20831645321 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20831645321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 138877561 + ... + 138877710.

Almost surely, 2^20831645325 is an apocalyptic number.

20831645325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20831645325 is a deficient number, since it is larger than the sum of its proper divisors (13610008403).

20831645325 is a wasteful number, since it uses less digits than its factorization.

20831645325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277755284 (or 277755279 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 39.

The spelling of 20831645325 in words is "twenty billion, eight hundred thirty-one million, six hundred forty-five thousand, three hundred twenty-five".