20247556561131 has 4 divisors (see below), whose sum is σ = 26996742081512. Its totient is φ = 13498371040752.

The previous prime is 20247556561129. The next prime is 20247556561189. The reversal of 20247556561131 is 13116565574202.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20247556561131 - 2¹ = 20247556561129 is a prime.

It is a super-2 number, since 2×20247556561131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20247556561031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3374592760186 + ... + 3374592760191.

It is an arithmetic number, because the mean of its divisors is an integer number (6749185520378).

Almost surely, 2^{20247556561131} is an apocalyptic number.

20247556561131 is a deficient number, since it is larger than the sum of its proper divisors (6749185520381).

20247556561131 is an equidigital number, since it uses as much as digits as its factorization.

20247556561131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6749185520380.

The product of its (nonzero) digits is 1512000, while the sum is 48.

The spelling of 20247556561131 in words is "twenty trillion, two hundred forty-seven billion, five hundred fifty-six million, five hundred sixty-one thousand, one hundred thirty-one".