20492201918557 has 2 divisors, whose sum is σ = 20492201918558. Its totient is φ = 20492201918556.

The previous prime is 20492201918491. The next prime is 20492201918563. The reversal of 20492201918557 is 75581910229402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20295331341156 + 196870577401 = 4505034^2 + 443701^2 .

It is a cyclic number.

It is not a de Polignac number, because 20492201918557 - 2¹¹ = 20492201916509 is a prime.

It is a super-2 number, since 2×20492201918557² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20492201918498 and 20492201918507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20492201918597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10246100959278 + 10246100959279.

It is an arithmetic number, because the mean of its divisors is an integer number (10246100959279).

Almost surely, 2^{20492201918557} is an apocalyptic number.

It is an amenable number.

20492201918557 is a deficient number, since it is larger than the sum of its proper divisors (1).

20492201918557 is an equidigital number, since it uses as much as digits as its factorization.

20492201918557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3628800, while the sum is 55.

The spelling of 20492201918557 in words is "twenty trillion, four hundred ninety-two billion, two hundred one million, nine hundred eighteen thousand, five hundred fifty-seven".