20311322309 has 4 divisors (see below), whose sum is σ = 20860277004. Its totient is φ = 19762367616.

The previous prime is 20311322303. The next prime is 20311322327. The reversal of 20311322309 is 90322311302.

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 9763416100 + 10547906209 = 98810^2 + 102703^2 .

It is a cyclic number.

It is not a de Polignac number, because 20311322309 - 2¹⁶ = 20311256773 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 (20311322303) 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, 274477292 + ... + 274477365.

It is an arithmetic number, because the mean of its divisors is an integer number (5215069251).

Almost surely, 2^20311322309 is an apocalyptic number.

It is an amenable number.

20311322309 is a deficient number, since it is larger than the sum of its proper divisors (548954695).

20311322309 is an equidigital number, since it uses as much as digits as its factorization.

20311322309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548954694.

The product of its (nonzero) digits is 1944, while the sum is 26.

The spelling of 20311322309 in words is "twenty billion, three hundred eleven million, three hundred twenty-two thousand, three hundred nine".