20722625 has 32 divisors (see below), whose sum is σ = 32258304. Its totient is φ = 12912000.

The previous prime is 20722621. The next prime is 20722649. The reversal of 20722625 is 52622702.

It is not a de Polignac number, because 20722625 - 2² = 20722621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20722594 and 20722603.

It is not an unprimeable number, because it can be changed into a prime (20722621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8549 + ... + 10701.

It is an arithmetic number, because the mean of its divisors is an integer number (1008072).

Almost surely, 2^20722625 is an apocalyptic number.

20722625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20722625 is a deficient number, since it is larger than the sum of its proper divisors (11535679).

20722625 is a wasteful number, since it uses less digits than its factorization.

20722625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2186 (or 2176 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 20722625 is about 4552.2110012608. The cubic root of 20722625 is about 274.6723370168.

The spelling of 20722625 in words is "twenty million, seven hundred twenty-two thousand, six hundred twenty-five".