20872525 has 12 divisors (see below), whose sum is σ = 26238772. Its totient is φ = 16467840.

The previous prime is 20872499. The next prime is 20872571. The reversal of 20872525 is 52527802.

It can be written as a sum of positive squares in 6 ways, for example, as 927369 + 19945156 = 963^2 + 4466^2 .

It is not a de Polignac number, because 20872525 - 2¹⁵ = 20839757 is a prime.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3894 + ... + 7543.

Almost surely, 2^20872525 is an apocalyptic number.

20872525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20872525 is a deficient number, since it is larger than the sum of its proper divisors (5366247).

20872525 is a wasteful number, since it uses less digits than its factorization.

20872525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11520 (or 11515 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 31.

The square root of 20872525 is about 4568.6458606462. The cubic root of 20872525 is about 275.3330400337. Note that the first 3 decimals are identical.

It can be divided in two parts, 208725 and 25, that multiplied together give a palindrome (5218125).

The spelling of 20872525 in words is "twenty million, eight hundred seventy-two thousand, five hundred twenty-five".