20757400625 has 20 divisors (see below), whose sum is σ = 27933723972. Its totient is φ = 15328536000.

The previous prime is 20757400607. The next prime is 20757400627. The reversal of 20757400625 is 52600475702.

It is a happy number.

It can be written as a sum of positive squares in 10 ways, for example, as 17394444544 + 3362956081 = 131888^2 + 57991^2 .

It is not a de Polignac number, because 20757400625 - 2¹⁸ = 20757138481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20757400627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1269254 + ... + 1285503.

Almost surely, 2^20757400625 is an apocalyptic number.

20757400625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20757400625 is a deficient number, since it is larger than the sum of its proper divisors (7176323347).

20757400625 is an equidigital number, since it uses as much as digits as its factorization.

20757400625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2554790 (or 2554775 counting only the distinct ones).

The product of its (nonzero) digits is 117600, while the sum is 38.

The spelling of 20757400625 in words is "twenty billion, seven hundred fifty-seven million, four hundred thousand, six hundred twenty-five".