20126402666643 has 64 divisors (see below), whose sum is σ = 33533358243840. Its totient is φ = 10454371394688.

The previous prime is 20126402666633. The next prime is 20126402666677. The reversal of 20126402666643 is 34666620462102.

It is not a de Polignac number, because 20126402666643 - 2⁴ = 20126402666627 is a prime.

It is a super-2 number, since 2×20126402666643² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20126402666592 and 20126402666601.

It is not an unprimeable number, because it can be changed into a prime (20126402666633) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7041880 + ... + 9478442.

It is an arithmetic number, because the mean of its divisors is an integer number (523958722560).

Almost surely, 2^{20126402666643} is an apocalyptic number.

20126402666643 is a deficient number, since it is larger than the sum of its proper divisors (13406955577197).

20126402666643 is a wasteful number, since it uses less digits than its factorization.

20126402666643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2437048.

The product of its (nonzero) digits is 2985984, while the sum is 48.

The spelling of 20126402666643 in words is "twenty trillion, one hundred twenty-six billion, four hundred two million, six hundred sixty-six thousand, six hundred forty-three".