20023644245405 has 4 divisors (see below), whose sum is σ = 24028373094492. Its totient is φ = 16018915396320.

The previous prime is 20023644245389. The next prime is 20023644245413. The reversal of 20023644245405 is 50454244632002.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13688209258564 + 6335434986841 = 3699758^2 + 2517029^2 .

It is not a de Polignac number, because 20023644245405 - 2⁴ = 20023644245389 is a prime.

It is a super-2 number, since 2×20023644245405² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2002364424536 + ... + 2002364424545.

It is an arithmetic number, because the mean of its divisors is an integer number (6007093273623).

Almost surely, 2^{20023644245405} is an apocalyptic number.

It is an amenable number.

20023644245405 is a deficient number, since it is larger than the sum of its proper divisors (4004728849087).

20023644245405 is an equidigital number, since it uses as much as digits as its factorization.

20023644245405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4004728849086.

The product of its (nonzero) digits is 921600, while the sum is 41.

Adding to 20023644245405 its reverse (50454244632002), we get a palindrome (70477888877407).

The spelling of 20023644245405 in words is "twenty trillion, twenty-three billion, six hundred forty-four million, two hundred forty-five thousand, four hundred five".