20131324225 has 24 divisors (see below), whose sum is σ = 25524303840. Its totient is φ = 15746833920.

The previous prime is 20131324223. The next prime is 20131324243. The reversal of 20131324225 is 52242313102.

It is not a de Polignac number, because 20131324225 - 2¹ = 20131324223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 20131324225.

It is not an unprimeable number, because it can be changed into a prime (20131324223) 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, 151266 + ... + 251284.

It is an arithmetic number, because the mean of its divisors is an integer number (1063512660).

Almost surely, 2^20131324225 is an apocalyptic number.

20131324225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20131324225 is a deficient number, since it is larger than the sum of its proper divisors (5392979615).

20131324225 is a wasteful number, since it uses less digits than its factorization.

20131324225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100209 (or 100204 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 20131324225 its reverse (52242313102), we get a palindrome (72373637327).

The spelling of 20131324225 in words is "twenty billion, one hundred thirty-one million, three hundred twenty-four thousand, two hundred twenty-five".