20404123204 has 12 divisors (see below), whose sum is σ = 35785352764. Its totient is φ = 10179736704.

The previous prime is 20404123177. The next prime is 20404123217. The reversal of 20404123204 is 40232140402.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 14942617600 + 5461505604 = 122240^2 + 73902^2 .

It is a super-2 number, since 2×20404123204² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5579169 + ... + 5582824.

Almost surely, 2^20404123204 is an apocalyptic number.

It is an amenable number.

20404123204 is a deficient number, since it is larger than the sum of its proper divisors (15381229560).

20404123204 is a wasteful number, since it uses less digits than its factorization.

20404123204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11162454 (or 11162452 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 20404123204 its reverse (40232140402), we get a palindrome (60636263606).

The spelling of 20404123204 in words is "twenty billion, four hundred four million, one hundred twenty-three thousand, two hundred four".