20423402523 has 24 divisors (see below), whose sum is σ = 31307047200. Its totient is φ = 12785451264.

The previous prime is 20423402459. The next prime is 20423402533. The reversal of 20423402523 is 32520432402.

It is a happy number.

20423402523 is a `hidden beast` number, since 204 + 2 + 3 + 402 + 52 + 3 = 666.

It is not a de Polignac number, because 20423402523 - 2⁶ = 20423402459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20423402533) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 84868 + ... + 219201.

It is an arithmetic number, because the mean of its divisors is an integer number (1304460300).

Almost surely, 2^20423402523 is an apocalyptic number.

20423402523 is a deficient number, since it is larger than the sum of its proper divisors (10883644677).

20423402523 is a wasteful number, since it uses less digits than its factorization.

20423402523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304531 (or 304528 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 27.

Adding to 20423402523 its reverse (32520432402), we get a palindrome (52943834925).

The spelling of 20423402523 in words is "twenty billion, four hundred twenty-three million, four hundred two thousand, five hundred twenty-three".