20312132251 has 16 divisors (see below), whose sum is σ = 20925068800. Its totient is φ = 19709034048.

The previous prime is 20312132213. The next prime is 20312132273. The reversal of 20312132251 is 15223121302.

It is a cyclic number.

It is not a de Polignac number, because 20312132251 - 2⁹ = 20312131739 is a prime.

It is a super-2 number, since 2×20312132251² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20312132051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4492570 + ... + 4497088.

It is an arithmetic number, because the mean of its divisors is an integer number (1307816800).

Almost surely, 2^20312132251 is an apocalyptic number.

20312132251 is a deficient number, since it is larger than the sum of its proper divisors (612936549).

20312132251 is an equidigital number, since it uses as much as digits as its factorization.

20312132251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5578.

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 20312132251 its reverse (15223121302), we get a palindrome (35535253553).

The spelling of 20312132251 in words is "twenty billion, three hundred twelve million, one hundred thirty-two thousand, two hundred fifty-one".