20523625 has 16 divisors (see below), whose sum is σ = 25857936. Its totient is φ = 16262400.

The previous prime is 20523623. The next prime is 20523649. The reversal of 20523625 is 52632502.

It can be written as a sum of positive squares in 8 ways, for example, as 6885376 + 13638249 = 2624^2 + 3693^2 .

It is not a de Polignac number, because 20523625 - 2¹ = 20523623 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20523625.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20523623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13399 + ... + 14851.

It is an arithmetic number, because the mean of its divisors is an integer number (1616121).

Almost surely, 2^20523625 is an apocalyptic number.

20523625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20523625 is a deficient number, since it is larger than the sum of its proper divisors (5334311).

20523625 is a wasteful number, since it uses less digits than its factorization.

20523625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1581 (or 1571 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 20523625 is about 4530.3007626426. The cubic root of 20523625 is about 273.7902785405.

The spelling of 20523625 in words is "twenty million, five hundred twenty-three thousand, six hundred twenty-five".