20864525 has 24 divisors (see below), whose sum is σ = 29890944. Its totient is φ = 14278400.

The previous prime is 20864513. The next prime is 20864533. The reversal of 20864525 is 52546802.

It is not a de Polignac number, because 20864525 - 2¹⁶ = 20798989 is a prime.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20864491 and 20864500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2444 + ... + 6906.

It is an arithmetic number, because the mean of its divisors is an integer number (1245456).

Almost surely, 2^20864525 is an apocalyptic number.

20864525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20864525 is a deficient number, since it is larger than the sum of its proper divisors (9026419).

20864525 is a wasteful number, since it uses less digits than its factorization.

20864525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4501 (or 4496 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 32.

The square root of 20864525 is about 4567.7702437842. The cubic root of 20864525 is about 275.2978590834.

It can be divided in two parts, 208645 and 25, that multiplied together give a palindrome (5216125).

The spelling of 20864525 in words is "twenty million, eight hundred sixty-four thousand, five hundred twenty-five".