20320938251 has 4 divisors (see below), whose sum is σ = 20326654752. Its totient is φ = 20315221752.

The previous prime is 20320938229. The next prime is 20320938257. The reversal of 20320938251 is 15283902302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20320938251 - 2³⁴ = 3141069067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20320938257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2852915 + ... + 2860028.

It is an arithmetic number, because the mean of its divisors is an integer number (5081663688).

Almost surely, 2^20320938251 is an apocalyptic number.

20320938251 is a deficient number, since it is larger than the sum of its proper divisors (5716501).

20320938251 is an equidigital number, since it uses as much as digits as its factorization.

20320938251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5716500.

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 20320938251 in words is "twenty billion, three hundred twenty million, nine hundred thirty-eight thousand, two hundred fifty-one".