20531525 has 24 divisors (see below), whose sum is σ = 30367104. Its totient is φ = 13464000.

The previous prime is 20531521. The next prime is 20531543. The reversal of 20531525 is 52513502.

It is not a de Polignac number, because 20531525 - 2² = 20531521 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

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 20531525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20531521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1475 + ... + 6575.

It is an arithmetic number, because the mean of its divisors is an integer number (1265296).

Almost surely, 2^20531525 is an apocalyptic number.

20531525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20531525 is a deficient number, since it is larger than the sum of its proper divisors (9835579).

20531525 is a wasteful number, since it uses less digits than its factorization.

20531525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5141 (or 5136 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 20531525 is about 4531.1725855456. The cubic root of 20531525 is about 273.8254033579.

The spelling of 20531525 in words is "twenty million, five hundred thirty-one thousand, five hundred twenty-five".