23420636731 has 4 divisors (see below), whose sum is σ = 23420958264. Its totient is φ = 23420315200.

The previous prime is 23420636717. The next prime is 23420636749. The reversal of 23420636731 is 13763602432.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 23420636731 - 2¹¹ = 23420634683 is a prime.

It is a super-2 number, since 2×23420636731² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23420636231) 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, 6516 + ... + 216526.

It is an arithmetic number, because the mean of its divisors is an integer number (5855239566).

Almost surely, 2^23420636731 is an apocalyptic number.

23420636731 is a deficient number, since it is larger than the sum of its proper divisors (321533).

23420636731 is a wasteful number, since it uses less digits than its factorization.

23420636731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321532.

The product of its (nonzero) digits is 108864, while the sum is 37.

The spelling of 23420636731 in words is "twenty-three billion, four hundred twenty million, six hundred thirty-six thousand, seven hundred thirty-one".