20373713921 has 6 divisors (see below), whose sum is σ = 22394247666. Its totient is φ = 18521558000.

The previous prime is 20373713909. The next prime is 20373713933. The reversal of 20373713921 is 12931737302.

It is an interprime number because it is at equal distance from previous prime (20373713909) and next prime (20373713933).

It can be written as a sum of positive squares in only one way, i.e., 20373565696 + 148225 = 142736^2 + 385^2 .

It is not a de Polignac number, because 20373713921 - 2¹⁰ = 20373712897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20373713951) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 84188780 + ... + 84189021.

It is an arithmetic number, because the mean of its divisors is an integer number (3732374611).

Almost surely, 2^20373713921 is an apocalyptic number.

It is an amenable number.

20373713921 is a deficient number, since it is larger than the sum of its proper divisors (2020533745).

20373713921 is a wasteful number, since it uses less digits than its factorization.

20373713921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168377823 (or 168377812 counting only the distinct ones).

The product of its (nonzero) digits is 47628, while the sum is 38.

The spelling of 20373713921 in words is "twenty billion, three hundred seventy-three million, seven hundred thirteen thousand, nine hundred twenty-one".