20637051625 has 16 divisors (see below), whose sum is σ = 25816282128. Its totient is φ = 16470384000.

The previous prime is 20637051613. The next prime is 20637051667. The reversal of 20637051625 is 52615073602.

It can be written as a sum of positive squares in 8 ways, for example, as 10143712656 + 10493338969 = 100716^2 + 102437^2 .

It is not a de Polignac number, because 20637051625 - 2⁵ = 20637051593 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143452 + ... + 248701.

It is an arithmetic number, because the mean of its divisors is an integer number (1613517633).

Almost surely, 2^20637051625 is an apocalyptic number.

20637051625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20637051625 is a deficient number, since it is larger than the sum of its proper divisors (5179230503).

20637051625 is an equidigital number, since it uses as much as digits as its factorization.

20637051625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392589 (or 392579 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 37.

The spelling of 20637051625 in words is "twenty billion, six hundred thirty-seven million, fifty-one thousand, six hundred twenty-five".