20501604423 has 24 divisors (see below), whose sum is σ = 29872802960. Its totient is φ = 13548332160.

The previous prime is 20501604419. The next prime is 20501604443. The reversal of 20501604423 is 32440610502.

20501604423 is a `hidden beast` number, since 2 + 0 + 50 + 1 + 604 + 4 + 2 + 3 = 666.

It is not a de Polignac number, because 20501604423 - 2² = 20501604419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20501604443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 814515 + ... + 839307.

Almost surely, 2^20501604423 is an apocalyptic number.

20501604423 is a deficient number, since it is larger than the sum of its proper divisors (9371198537).

20501604423 is a wasteful number, since it uses less digits than its factorization.

20501604423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25599 (or 25596 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The spelling of 20501604423 in words is "twenty billion, five hundred one million, six hundred four thousand, four hundred twenty-three".