25920274420 has 24 divisors (see below), whose sum is σ = 54714618504. Its totient is φ = 10314387456.

The previous prime is 25920274417. The next prime is 25920274427. The reversal of 25920274420 is 2447202952.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3265208164 + 22655066256 = 57142^2 + 150516^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 25920274420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25920274427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3353689 + ... + 3361408.

It is an arithmetic number, because the mean of its divisors is an integer number (2279775771).

Almost surely, 2^25920274420 is an apocalyptic number.

25920274420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25920274420 is an abundant number, since it is smaller than the sum of its proper divisors (28794344084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25920274420 is a wasteful number, since it uses less digits than its factorization.

25920274420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6715299 (or 6715297 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 37.

The spelling of 25920274420 in words is "twenty-five billion, nine hundred twenty million, two hundred seventy-four thousand, four hundred twenty".