20131245265 has 8 divisors (see below), whose sum is σ = 24163232040. Its totient is φ = 16101171072.

The previous prime is 20131245257. The next prime is 20131245331. The reversal of 20131245265 is 56254213102.

It can be written as a sum of positive squares in 4 ways, for example, as 13844816896 + 6286428369 = 117664^2 + 79287^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20131245265 - 2³ = 20131245257 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 454884 + ... + 497173.

It is an arithmetic number, because the mean of its divisors is an integer number (3020404005).

Almost surely, 2^20131245265 is an apocalyptic number.

It is an amenable number.

20131245265 is a deficient number, since it is larger than the sum of its proper divisors (4031986775).

20131245265 is an equidigital number, since it uses as much as digits as its factorization.

20131245265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 956291.

The product of its (nonzero) digits is 14400, while the sum is 31.

Adding to 20131245265 its reverse (56254213102), we get a palindrome (76385458367).

The spelling of 20131245265 in words is "twenty billion, one hundred thirty-one million, two hundred forty-five thousand, two hundred sixty-five".