20700517625 has 8 divisors (see below), whose sum is σ = 25834246152. Its totient is φ = 16560414000.

The previous prime is 20700517603. The next prime is 20700517639. The reversal of 20700517625 is 52671500702.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1796742544 + 18903775081 = 42388^2 + 137491^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20700517625 is a prime.

It is a super-2 number, since 2×20700517625² (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 (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82801946 + ... + 82802195.

It is an arithmetic number, because the mean of its divisors is an integer number (3229280769).

Almost surely, 2^20700517625 is an apocalyptic number.

20700517625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20700517625 is a deficient number, since it is larger than the sum of its proper divisors (5133728527).

20700517625 is an equidigital number, since it uses as much as digits as its factorization.

20700517625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165604156 (or 165604146 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 35.

The spelling of 20700517625 in words is "twenty billion, seven hundred million, five hundred seventeen thousand, six hundred twenty-five".