31320020023 has 24 divisors (see below), whose sum is σ = 35255077200. Its totient is φ = 27717659904.

The previous prime is 31320020021. The next prime is 31320020029. The reversal of 31320020023 is 32002002313.

It is not a de Polignac number, because 31320020023 - 2¹ = 31320020021 is a prime.

It is a super-2 number, since 2×31320020023² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31320019979 and 31320020006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31320020021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 501073 + ... + 560101.

It is an arithmetic number, because the mean of its divisors is an integer number (1468961550).

Almost surely, 2^31320020023 is an apocalyptic number.

31320020023 is a deficient number, since it is larger than the sum of its proper divisors (3935057177).

31320020023 is a wasteful number, since it uses less digits than its factorization.

31320020023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59151 (or 59128 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 16.

Adding to 31320020023 its reverse (32002002313), we get a palindrome (63322022336).

The spelling of 31320020023 in words is "thirty-one billion, three hundred twenty million, twenty thousand, twenty-three".