20404725 has 24 divisors (see below), whose sum is σ = 36804192. Its totient is φ = 9892800.

The previous prime is 20404717. The next prime is 20404729. The reversal of 20404725 is 52740402.

It is not a de Polignac number, because 20404725 - 2³ = 20404717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20404695 and 20404704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404729) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11542 + ... + 13191.

It is an arithmetic number, because the mean of its divisors is an integer number (1533508).

Almost surely, 2^20404725 is an apocalyptic number.

20404725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20404725 is a deficient number, since it is larger than the sum of its proper divisors (16399467).

20404725 is a wasteful number, since it uses less digits than its factorization.

20404725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24757 (or 24752 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 24.

The square root of 20404725 is about 4517.1589522619. The cubic root of 20404725 is about 273.2605356731.

The spelling of 20404725 in words is "twenty million, four hundred four thousand, seven hundred twenty-five".