20312224813 has 4 divisors (see below), whose sum is σ = 20861203900. Its totient is φ = 19763245728.

The previous prime is 20312224799. The next prime is 20312224817. The reversal of 20312224813 is 31842221302.

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 7096883049 + 13215341764 = 84243^2 + 114958^2 .

It is a cyclic number.

It is not a de Polignac number, because 20312224813 - 2¹⁷ = 20312093741 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 (20312224817) 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, 274489488 + ... + 274489561.

It is an arithmetic number, because the mean of its divisors is an integer number (5215300975).

Almost surely, 2^20312224813 is an apocalyptic number.

It is an amenable number.

20312224813 is a deficient number, since it is larger than the sum of its proper divisors (548979087).

20312224813 is an equidigital number, since it uses as much as digits as its factorization.

20312224813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548979086.

The product of its (nonzero) digits is 4608, while the sum is 28.

The spelling of 20312224813 in words is "twenty billion, three hundred twelve million, two hundred twenty-four thousand, eight hundred thirteen".