20136432636643 has 4 divisors (see below), whose sum is σ = 20136459036240. Its totient is φ = 20136406237048.

The previous prime is 20136432636601. The next prime is 20136432636673. The reversal of 20136432636643 is 34663623463102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20136432636643 - 2²⁵ = 20136399082211 is a prime.

It is a super-2 number, since 2×20136432636643² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20136432636673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12020548 + ... + 13592881.

It is an arithmetic number, because the mean of its divisors is an integer number (5034114759060).

Almost surely, 2^{20136432636643} is an apocalyptic number.

20136432636643 is a deficient number, since it is larger than the sum of its proper divisors (26399597).

20136432636643 is an equidigital number, since it uses as much as digits as its factorization.

20136432636643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26399596.

The product of its (nonzero) digits is 6718464, while the sum is 49.

The spelling of 20136432636643 in words is "twenty trillion, one hundred thirty-six billion, four hundred thirty-two million, six hundred thirty-six thousand, six hundred forty-three".