20315323157 has 4 divisors (see below), whose sum is σ = 20318464236. Its totient is φ = 20312182080.

The previous prime is 20315323151. The next prime is 20315323169. The reversal of 20315323157 is 75132351302.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19085698801 + 1229624356 = 138151^2 + 35066^2 .

It is a cyclic number.

It is not a de Polignac number, because 20315323157 - 2¹⁴ = 20315306773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20315323151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1560818 + ... + 1573779.

It is an arithmetic number, because the mean of its divisors is an integer number (5079616059).

Almost surely, 2^20315323157 is an apocalyptic number.

It is an amenable number.

20315323157 is a deficient number, since it is larger than the sum of its proper divisors (3141079).

20315323157 is an equidigital number, since it uses as much as digits as its factorization.

20315323157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3141078.

The product of its (nonzero) digits is 18900, while the sum is 32.

Adding to 20315323157 its reverse (75132351302), we get a palindrome (95447674459).

The spelling of 20315323157 in words is "twenty billion, three hundred fifteen million, three hundred twenty-three thousand, one hundred fifty-seven".