20531325 has 24 divisors (see below), whose sum is σ = 35944128. Its totient is φ = 10305280.

The previous prime is 20531297. The next prime is 20531347. The reversal of 20531325 is 52313502.

It is not a de Polignac number, because 20531325 - 2¹¹ = 20529277 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 6777 + ... + 9326.

It is an arithmetic number, because the mean of its divisors is an integer number (1497672).

Almost surely, 2^20531325 is an apocalyptic number.

20531325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20531325 is a deficient number, since it is larger than the sum of its proper divisors (15412803).

20531325 is a wasteful number, since it uses less digits than its factorization.

20531325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16133 (or 16128 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 20531325 is about 4531.1505161493. The cubic root of 20531325 is about 273.8245142332.

Adding to 20531325 its reverse (52313502), we get a palindrome (72844827).

The spelling of 20531325 in words is "twenty million, five hundred thirty-one thousand, three hundred twenty-five".