20950856425 has 36 divisors (see below), whose sum is σ = 27082022220. Its totient is φ = 16058546560.

The previous prime is 20950856411. The next prime is 20950856447. The reversal of 20950856425 is 52465805902.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 760435776 + 20190420649 = 27576^2 + 142093^2 .

It is not a de Polignac number, because 20950856425 - 2¹¹ = 20950854377 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 54701784 + ... + 54702166.

It is an arithmetic number, because the mean of its divisors is an integer number (752278395).

Almost surely, 2^20950856425 is an apocalyptic number.

20950856425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20950856425 is a deficient number, since it is larger than the sum of its proper divisors (6131165795).

20950856425 is an equidigital number, since it uses as much as digits as its factorization.

20950856425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1002 (or 614 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 46.

The spelling of 20950856425 in words is "twenty billion, nine hundred fifty million, eight hundred fifty-six thousand, four hundred twenty-five".