20397581063 has 2 divisors, whose sum is σ = 20397581064. Its totient is φ = 20397581062.

The previous prime is 20397581051. The next prime is 20397581069. The reversal of 20397581063 is 36018579302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20397581063 - 2⁴ = 20397581047 is a prime.

It is a super-2 number, since 2×20397581063² (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 (20397581069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10198790531 + 10198790532.

It is an arithmetic number, because the mean of its divisors is an integer number (10198790532).

Almost surely, 2^20397581063 is an apocalyptic number.

20397581063 is a deficient number, since it is larger than the sum of its proper divisors (1).

20397581063 is an equidigital number, since it uses as much as digits as its factorization.

20397581063 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 44.

The spelling of 20397581063 in words is "twenty billion, three hundred ninety-seven million, five hundred eighty-one thousand, sixty-three".