20431325 has 24 divisors (see below), whose sum is σ = 26831616. Its totient is φ = 15408000.

The previous prime is 20431319. The next prime is 20431343. The reversal of 20431325 is 52313402.

It is a happy number.

It is not a de Polignac number, because 20431325 - 2⁴ = 20431309 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20431297 and 20431306.

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, 31454 + ... + 32096.

It is an arithmetic number, because the mean of its divisors is an integer number (1117984).

Almost surely, 2^20431325 is an apocalyptic number.

20431325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20431325 is a deficient number, since it is larger than the sum of its proper divisors (6400291).

20431325 is a wasteful number, since it uses less digits than its factorization.

20431325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725 (or 720 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 20431325 is about 4520.1023218507. The cubic root of 20431325 is about 273.3792267113.

Adding to 20431325 its reverse (52313402), we get a palindrome (72744727).

The spelling of 20431325 in words is "twenty million, four hundred thirty-one thousand, three hundred twenty-five".