20631561115444 has 12 divisors (see below), whose sum is σ = 36185644498500. Its totient is φ = 10292805544448.

The previous prime is 20631561115439. The next prime is 20631561115481. The reversal of 20631561115444 is 44451116513602.

It can be written as a sum of positive squares in 2 ways, for example, as 15673190087844 + 4958371027600 = 3958938^2 + 2226740^2 .

It is a super-2 number, since 2×20631561115444² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20631561115444.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5743751299 + ... + 5743754890.

It is an arithmetic number, because the mean of its divisors is an integer number (3015470374875).

Almost surely, 2^{20631561115444} is an apocalyptic number.

It is an amenable number.

20631561115444 is a deficient number, since it is larger than the sum of its proper divisors (15554083383056).

20631561115444 is a wasteful number, since it uses less digits than its factorization.

20631561115444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11487506642 (or 11487506640 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 43.

The spelling of 20631561115444 in words is "twenty trillion, six hundred thirty-one billion, five hundred sixty-one million, one hundred fifteen thousand, four hundred forty-four".