20423204775 has 72 divisors (see below), whose sum is σ = 38289204096. Its totient is φ = 10386446400.

The previous prime is 20423204771. The next prime is 20423204777. The reversal of 20423204775 is 57740232402.

It is a happy number.

20423204775 is a `hidden beast` number, since 20 + 423 + 204 + 7 + 7 + 5 = 666.

It is not a de Polignac number, because 20423204775 - 2² = 20423204771 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20423204771) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1706964 + ... + 1718886.

Almost surely, 2^20423204775 is an apocalyptic number.

20423204775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20423204775 is a deficient number, since it is larger than the sum of its proper divisors (17865999321).

20423204775 is a wasteful number, since it uses less digits than its factorization.

20423204775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12293 (or 12285 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 36.

The spelling of 20423204775 in words is "twenty billion, four hundred twenty-three million, two hundred four thousand, seven hundred seventy-five".