20212320031 has 4 divisors (see below), whose sum is σ = 20325238200. Its totient is φ = 20099401864.

The previous prime is 20212319987. The next prime is 20212320109. The reversal of 20212320031 is 13002321202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20212320031 is a prime.

It is a super-2 number, since 2×20212320031² (a number of 21 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 = 20212319987 and 20212320014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212320431) 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, 56458816 + ... + 56459173.

It is an arithmetic number, because the mean of its divisors is an integer number (5081309550).

Almost surely, 2^20212320031 is an apocalyptic number.

20212320031 is a deficient number, since it is larger than the sum of its proper divisors (112918169).

20212320031 is a wasteful number, since it uses less digits than its factorization.

20212320031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112918168.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 20212320031 its reverse (13002321202), we get a palindrome (33214641233).

The spelling of 20212320031 in words is "twenty billion, two hundred twelve million, three hundred twenty thousand, thirty-one".