20956232831 has 2 divisors, whose sum is σ = 20956232832. Its totient is φ = 20956232830.

The previous prime is 20956232783. The next prime is 20956232881. The reversal of 20956232831 is 13823265902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20956232831 - 2⁶ = 20956232767 is a prime.

It is a super-2 number, since 2×20956232831² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20956232881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10478116415 + 10478116416.

It is an arithmetic number, because the mean of its divisors is an integer number (10478116416).

Almost surely, 2^20956232831 is an apocalyptic number.

20956232831 is a deficient number, since it is larger than the sum of its proper divisors (1).

20956232831 is an equidigital number, since it uses as much as digits as its factorization.

20956232831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 41.

The spelling of 20956232831 in words is "twenty billion, nine hundred fifty-six million, two hundred thirty-two thousand, eight hundred thirty-one".