20631561115413 has 8 divisors (see below), whose sum is σ = 28179693230976. Its totient is φ = 13418901538400.

The previous prime is 20631561115391. The next prime is 20631561115427. The reversal of 20631561115413 is 31451116513602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20631561115413 - 2¹³ = 20631561107221 is a prime.

It is a super-2 number, since 2×20631561115413² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20631561015413) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 83868134493 + ... + 83868134738.

It is an arithmetic number, because the mean of its divisors is an integer number (3522461653872).

Almost surely, 2^{20631561115413} is an apocalyptic number.

It is an amenable number.

20631561115413 is a deficient number, since it is larger than the sum of its proper divisors (7548132115563).

20631561115413 is a wasteful number, since it uses less digits than its factorization.

20631561115413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167736269275.

The product of its (nonzero) digits is 64800, while the sum is 39.

The spelling of 20631561115413 in words is "twenty trillion, six hundred thirty-one billion, five hundred sixty-one million, one hundred fifteen thousand, four hundred thirteen".