20713625 has 8 divisors (see below), whose sum is σ = 25850760. Its totient is φ = 16570800.

The previous prime is 20713613. The next prime is 20713631. The reversal of 20713625 is 52631702.

It can be written as a sum of positive squares in 4 ways, for example, as 38416 + 20675209 = 196^2 + 4547^2 .

It is not a de Polignac number, because 20713625 - 2⁸ = 20713369 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20713594 and 20713603.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82730 + ... + 82979.

It is an arithmetic number, because the mean of its divisors is an integer number (3231345).

Almost surely, 2^20713625 is an apocalyptic number.

20713625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20713625 is a deficient number, since it is larger than the sum of its proper divisors (5137135).

20713625 is an equidigital number, since it uses as much as digits as its factorization.

20713625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165724 (or 165714 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 20713625 is about 4551.2223632778. Note that the first 3 decimals coincide. The cubic root of 20713625 is about 274.6325671357.

The spelling of 20713625 in words is "twenty million, seven hundred thirteen thousand, six hundred twenty-five".