20720406627931 has 2 divisors, whose sum is σ = 20720406627932. Its totient is φ = 20720406627930.

The previous prime is 20720406627853. The next prime is 20720406627937. The reversal of 20720406627931 is 13972660402702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20720406627931 - 2¹⁹ = 20720406103643 is a prime.

It is a super-2 number, since 2×20720406627931² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20720406627937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10360203313965 + 10360203313966.

It is an arithmetic number, because the mean of its divisors is an integer number (10360203313966).

Almost surely, 2^{20720406627931} is an apocalyptic number.

20720406627931 is a deficient number, since it is larger than the sum of its proper divisors (1).

20720406627931 is an equidigital number, since it uses as much as digits as its factorization.

20720406627931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1524096, while the sum is 49.

The spelling of 20720406627931 in words is "twenty trillion, seven hundred twenty billion, four hundred six million, six hundred twenty-seven thousand, nine hundred thirty-one".