20810725425 has 36 divisors (see below), whose sum is σ = 42599227840. Its totient is φ = 9513473760.

The previous prime is 20810725421. The next prime is 20810725451. The reversal of 20810725425 is 52452701802.

It is a happy number.

20810725425 is a `hidden beast` number, since 2 + 0 + 8 + 107 + 2 + 542 + 5 = 666.

It is not a de Polignac number, because 20810725425 - 2² = 20810725421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20810725425.

It is not an unprimeable number, because it can be changed into a prime (20810725421) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 6605005 + ... + 6608154.

Almost surely, 2^20810725425 is an apocalyptic number.

20810725425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20810725425 is an abundant number, since it is smaller than the sum of its proper divisors (21788502415).

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

20810725425 is a wasteful number, since it uses less digits than its factorization.

20810725425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13213182 (or 13213174 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 36.

The spelling of 20810725425 in words is "twenty billion, eight hundred ten million, seven hundred twenty-five thousand, four hundred twenty-five".