20312322320 has 20 divisors (see below), whose sum is σ = 47226149580. Its totient is φ = 8124928896.

The previous prime is 20312322307. The next prime is 20312322383. The reversal of 20312322320 is 2322321302.

It can be written as a sum of positive squares in 2 ways, for example, as 15862898704 + 4449423616 = 125948^2 + 66704^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20312322292 and 20312322301.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126951935 + ... + 126952094.

It is an arithmetic number, because the mean of its divisors is an integer number (2361307479).

Almost surely, 2^20312322320 is an apocalyptic number.

20312322320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20312322320 is an abundant number, since it is smaller than the sum of its proper divisors (26913827260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20312322320 is a wasteful number, since it uses less digits than its factorization.

20312322320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253904042 (or 253904036 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 20312322320 its reverse (2322321302), we get a palindrome (22634643622).

The spelling of 20312322320 in words is "twenty billion, three hundred twelve million, three hundred twenty-two thousand, three hundred twenty".