20645017592929 has 2 divisors, whose sum is σ = 20645017592930. Its totient is φ = 20645017592928.

The previous prime is 20645017592923. The next prime is 20645017592959. The reversal of 20645017592929 is 92929571054602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19480394595600 + 1164622997329 = 4413660^2 + 1079177^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20645017592929 is a prime.

It is not a weakly prime, because it can be changed into another prime (20645017592923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10322508796464 + 10322508796465.

It is an arithmetic number, because the mean of its divisors is an integer number (10322508796465).

Almost surely, 2^{20645017592929} is an apocalyptic number.

It is an amenable number.

20645017592929 is a deficient number, since it is larger than the sum of its proper divisors (1).

20645017592929 is an equidigital number, since it uses as much as digits as its factorization.

20645017592929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24494400, while the sum is 61.

The spelling of 20645017592929 in words is "twenty trillion, six hundred forty-five billion, seventeen million, five hundred ninety-two thousand, nine hundred twenty-nine".