20438423135601 has 16 divisors (see below), whose sum is σ = 27282583810944. Its totient is φ = 13609942222464.

The previous prime is 20438423135551. The next prime is 20438423135623. The reversal of 20438423135601 is 10653132483402.

It is not a de Polignac number, because 20438423135601 - 2²⁷ = 20438288917873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20438423135681) 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 15 ways as a sum of consecutive naturals, for example, 24813165 + ... + 25623621.

It is an arithmetic number, because the mean of its divisors is an integer number (1705161488184).

Almost surely, 2^{20438423135601} is an apocalyptic number.

It is an amenable number.

20438423135601 is a deficient number, since it is larger than the sum of its proper divisors (6844160675343).

20438423135601 is an equidigital number, since it uses as much as digits as its factorization.

20438423135601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820120.

The product of its (nonzero) digits is 414720, while the sum is 42.

The spelling of 20438423135601 in words is "twenty trillion, four hundred thirty-eight billion, four hundred twenty-three million, one hundred thirty-five thousand, six hundred one".