20315021513 has 8 divisors (see below), whose sum is σ = 20359282848. Its totient is φ = 20270787264.

The previous prime is 20315021501. The next prime is 20315021567. The reversal of 20315021513 is 31512051302.

It is a happy number.

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

It is not a de Polignac number, because 20315021513 - 2⁴ = 20315021497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20315021213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2316545 + ... + 2325297.

It is an arithmetic number, because the mean of its divisors is an integer number (2544910356).

Almost surely, 2^20315021513 is an apocalyptic number.

It is an amenable number.

20315021513 is a deficient number, since it is larger than the sum of its proper divisors (44261335).

20315021513 is an equidigital number, since it uses as much as digits as its factorization.

20315021513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13543.

The product of its (nonzero) digits is 900, while the sum is 23.

Adding to 20315021513 its reverse (31512051302), we get a palindrome (51827072815).

The spelling of 20315021513 in words is "twenty billion, three hundred fifteen million, twenty-one thousand, five hundred thirteen".