20564625 has 64 divisors (see below), whose sum is σ = 37140480. Its totient is φ = 10080000.

The previous prime is 20564623. The next prime is 20564639. The reversal of 20564625 is 52646502.

It is not a de Polignac number, because 20564625 - 2¹ = 20564623 is a prime.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20564592 and 20564601.

It is not an unprimeable number, because it can be changed into a prime (20564623) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 337095 + ... + 337155.

It is an arithmetic number, because the mean of its divisors is an integer number (580320).

Almost surely, 2^20564625 is an apocalyptic number.

20564625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20564625 is a deficient number, since it is larger than the sum of its proper divisors (16575855).

20564625 is a wasteful number, since it uses less digits than its factorization.

20564625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 129 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 20564625 is about 4534.8235908357. The cubic root of 20564625 is about 273.9724740139.

The spelling of 20564625 in words is "twenty million, five hundred sixty-four thousand, six hundred twenty-five".