20126372706561 has 8 divisors (see below), whose sum is σ = 29274723936864. Its totient is φ = 12197801640320.

The previous prime is 20126372706541. The next prime is 20126372706599. The reversal of 20126372706561 is 16560727362102.

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 20126372706561 - 2⁶ = 20126372706497 is a prime.

It is a super-2 number, since 2×20126372706561² (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 20126372706561.

It is not an unprimeable number, because it can be changed into a prime (20126372706541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 304945040976 + ... + 304945041041.

It is an arithmetic number, because the mean of its divisors is an integer number (3659340492108).

Almost surely, 2^{20126372706561} is an apocalyptic number.

It is an amenable number.

20126372706561 is a deficient number, since it is larger than the sum of its proper divisors (9148351230303).

20126372706561 is a wasteful number, since it uses less digits than its factorization.

20126372706561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609890082031.

The product of its (nonzero) digits is 1270080, while the sum is 48.

The spelling of 20126372706561 in words is "twenty trillion, one hundred twenty-six billion, three hundred seventy-two million, seven hundred six thousand, five hundred sixty-one".