20631561115412 has 48 divisors (see below), whose sum is σ = 39934400918160. Its totient is φ = 9264677087232.

The previous prime is 20631561115391. The next prime is 20631561115427. The reversal of 20631561115412 is 21451116513602.

It can be written as a sum of positive squares in 8 ways, for example, as 396804245776 + 20234756869636 = 629924^2 + 4498306^2 .

It is a super-2 number, since 2×20631561115412² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99615548 + ... + 99822444.

It is an arithmetic number, because the mean of its divisors is an integer number (831966685795).

Almost surely, 2^{20631561115412} is an apocalyptic number.

It is an amenable number.

20631561115412 is a deficient number, since it is larger than the sum of its proper divisors (19302839802748).

20631561115412 is a wasteful number, since it uses less digits than its factorization.

20631561115412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258780 (or 258778 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 38.

The spelling of 20631561115412 in words is "twenty trillion, six hundred thirty-one billion, five hundred sixty-one million, one hundred fifteen thousand, four hundred twelve".