20315613243 has 4 divisors (see below), whose sum is σ = 27087484328. Its totient is φ = 13543742160.

The previous prime is 20315613239. The next prime is 20315613251. The reversal of 20315613243 is 34231651302.

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

It is not a de Polignac number, because 20315613243 - 2² = 20315613239 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20315613243.

It is not an unprimeable number, because it can be changed into a prime (20315623243) 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, 3385935538 + ... + 3385935543.

It is an arithmetic number, because the mean of its divisors is an integer number (6771871082).

Almost surely, 2^20315613243 is an apocalyptic number.

20315613243 is a deficient number, since it is larger than the sum of its proper divisors (6771871085).

20315613243 is an equidigital number, since it uses as much as digits as its factorization.

20315613243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6771871084.

The product of its (nonzero) digits is 12960, while the sum is 30.

The spelling of 20315613243 in words is "twenty billion, three hundred fifteen million, six hundred thirteen thousand, two hundred forty-three".