20312809973 has 8 divisors (see below), whose sum is σ = 21230567808. Its totient is φ = 19397934864.

The previous prime is 20312809969. The next prime is 20312809991. The reversal of 20312809973 is 37990821302.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20312809973 - 2² = 20312809969 is a prime.

It is a super-2 number, since 2×20312809973² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20312802973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 706265 + ... + 734462.

It is an arithmetic number, because the mean of its divisors is an integer number (2653820976).

Almost surely, 2^20312809973 is an apocalyptic number.

20312809973 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20312809973 is a deficient number, since it is larger than the sum of its proper divisors (917757835).

20312809973 is a wasteful number, since it uses less digits than its factorization.

20312809973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1441363.

The product of its (nonzero) digits is 163296, while the sum is 44.

The spelling of 20312809973 in words is "twenty billion, three hundred twelve million, eight hundred nine thousand, nine hundred seventy-three".