20455715561023 has 2 divisors, whose sum is σ = 20455715561024. Its totient is φ = 20455715561022.

The previous prime is 20455715561011. The next prime is 20455715561041. The reversal of 20455715561023 is 32016551755402.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20455715561023 is a prime.

It is a super-2 number, since 2×20455715561023² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20455715561123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10227857780511 + 10227857780512.

It is an arithmetic number, because the mean of its divisors is an integer number (10227857780512).

Almost surely, 2^{20455715561023} is an apocalyptic number.

20455715561023 is a deficient number, since it is larger than the sum of its proper divisors (1).

20455715561023 is an equidigital number, since it uses as much as digits as its factorization.

20455715561023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1260000, while the sum is 46.

The spelling of 20455715561023 in words is "twenty trillion, four hundred fifty-five billion, seven hundred fifteen million, five hundred sixty-one thousand, twenty-three".