20731325 has 24 divisors (see below), whose sum is σ = 26539968. Its totient is φ = 16058880.

The previous prime is 20731309. The next prime is 20731327. The reversal of 20731325 is 52313702.

It is not a de Polignac number, because 20731325 - 2⁴ = 20731309 is a prime.

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 20731325.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20731327) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 201224 + ... + 201326.

It is an arithmetic number, because the mean of its divisors is an integer number (1105832).

Almost surely, 2^20731325 is an apocalyptic number.

20731325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20731325 is a deficient number, since it is larger than the sum of its proper divisors (5808643).

20731325 is a wasteful number, since it uses less digits than its factorization.

20731325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 20731325 is about 4553.1664805935. The cubic root of 20731325 is about 274.7107702911.

The spelling of 20731325 in words is "twenty million, seven hundred thirty-one thousand, three hundred twenty-five".