20574254958781 has 12 divisors (see below), whose sum is σ = 21855991713940. Its totient is φ = 19363743060480.

The previous prime is 20574254958773. The next prime is 20574254958809. The reversal of 20574254958781 is 18785945247502.

It can be written as a sum of positive squares in 6 ways, for example, as 470823779556 + 20103431179225 = 686166^2 + 4483685^2 .

It is not a de Polignac number, because 20574254958781 - 2³ = 20574254958773 is a prime.

It is a super-2 number, since 2×20574254958781² (a number of 27 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (67) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20574254958701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22913311 + ... + 23794291.

Almost surely, 2^{20574254958781} is an apocalyptic number.

It is an amenable number.

20574254958781 is a deficient number, since it is larger than the sum of its proper divisors (1281736755159).

20574254958781 is an equidigital number, since it uses as much as digits as its factorization.

20574254958781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961824 (or 961807 counting only the distinct ones).

The product of its (nonzero) digits is 225792000, while the sum is 67.

The spelling of 20574254958781 in words is "twenty trillion, five hundred seventy-four billion, two hundred fifty-four million, nine hundred fifty-eight thousand, seven hundred eighty-one".