20625525 has 54 divisors (see below), whose sum is σ = 38611430. Its totient is φ = 10523520.

The previous prime is 20625499. The next prime is 20625529. The reversal of 20625525 is 52552602.

It can be written as a sum of positive squares in 9 ways, for example, as 3261636 + 17363889 = 1806^2 + 4167^2 .

It is not a de Polignac number, because 20625525 - 2²² = 16431221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20625529) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 189171 + ... + 189279.

Almost surely, 2^20625525 is an apocalyptic number.

20625525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20625525 is a deficient number, since it is larger than the sum of its proper divisors (17985905).

20625525 is a wasteful number, since it uses less digits than its factorization.

20625525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183 (or 146 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 20625525 is about 4541.5333313761. The cubic root of 20625525 is about 274.2426544895.

The spelling of 20625525 in words is "twenty million, six hundred twenty-five thousand, five hundred twenty-five".