20131525 has 24 divisors (see below), whose sum is σ = 26046944. Its totient is φ = 15422400.

The previous prime is 20131523. The next prime is 20131541. The reversal of 20131525 is 52513102.

It is not a de Polignac number, because 20131525 - 2¹ = 20131523 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65422 + ... + 65728.

Almost surely, 2^20131525 is an apocalyptic number.

20131525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20131525 is a deficient number, since it is larger than the sum of its proper divisors (5915419).

20131525 is a wasteful number, since it uses less digits than its factorization.

20131525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421 (or 416 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 20131525 is about 4486.8168003608. The cubic root of 20131525 is about 272.0354850259.

Adding to 20131525 its reverse (52513102), we get a palindrome (72644627).

The spelling of 20131525 in words is "twenty million, one hundred thirty-one thousand, five hundred twenty-five".