20321020291931 has 2 divisors, whose sum is σ = 20321020291932. Its totient is φ = 20321020291930.

The previous prime is 20321020291921. The next prime is 20321020291963. The reversal of 20321020291931 is 13919202012302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20321020291931 - 2¹⁸ = 20321020029787 is a prime.

It is a super-2 number, since 2×20321020291931² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20321020291891 and 20321020291900.

It is not a weakly prime, because it can be changed into another prime (20321020291921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160510145965 + 10160510145966.

It is an arithmetic number, because the mean of its divisors is an integer number (10160510145966).

Almost surely, 2^{20321020291931} is an apocalyptic number.

20321020291931 is a deficient number, since it is larger than the sum of its proper divisors (1).

20321020291931 is an equidigital number, since it uses as much as digits as its factorization.

20321020291931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 35.

The spelling of 20321020291931 in words is "twenty trillion, three hundred twenty-one billion, twenty million, two hundred ninety-one thousand, nine hundred thirty-one".