20942924831 has 2 divisors, whose sum is σ = 20942924832. Its totient is φ = 20942924830.

The previous prime is 20942924771. The next prime is 20942924843. The reversal of 20942924831 is 13842924902.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20942924831 is a prime.

It is a super-2 number, since 2×20942924831² (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 (20942924881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10471462415 + 10471462416.

It is an arithmetic number, because the mean of its divisors is an integer number (10471462416).

Almost surely, 2^20942924831 is an apocalyptic number.

20942924831 is a deficient number, since it is larger than the sum of its proper divisors (1).

20942924831 is an equidigital number, since it uses as much as digits as its factorization.

20942924831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 44.

The spelling of 20942924831 in words is "twenty billion, nine hundred forty-two million, nine hundred twenty-four thousand, eight hundred thirty-one".