20702573028581 has 2 divisors, whose sum is σ = 20702573028582. Its totient is φ = 20702573028580.

The previous prime is 20702573028451. The next prime is 20702573028587. The reversal of 20702573028581 is 18582037520702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18841381323556 + 1861191705025 = 4340666^2 + 1364255^2 .

It is a cyclic number.

It is not a de Polignac number, because 20702573028581 - 2¹⁰ = 20702573027557 is a prime.

It is a super-2 number, since 2×20702573028581² (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 (20702573028587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10351286514290 + 10351286514291.

It is an arithmetic number, because the mean of its divisors is an integer number (10351286514291).

Almost surely, 2^{20702573028581} is an apocalyptic number.

It is an amenable number.

20702573028581 is a deficient number, since it is larger than the sum of its proper divisors (1).

20702573028581 is an equidigital number, since it uses as much as digits as its factorization.

20702573028581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1881600, while the sum is 50.

The spelling of 20702573028581 in words is "twenty trillion, seven hundred two billion, five hundred seventy-three million, twenty-eight thousand, five hundred eighty-one".