20404421223 has 8 divisors (see below), whose sum is σ = 27307033200. Its totient is φ = 13552378368.

The previous prime is 20404421209. The next prime is 20404421243. The reversal of 20404421223 is 32212440402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20404421223 - 2¹⁶ = 20404355687 is a prime.

It is a super-2 number, since 2×20404421223² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20404421193 and 20404421202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404421243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12641338 + ... + 12642951.

It is an arithmetic number, because the mean of its divisors is an integer number (3413379150).

Almost surely, 2^20404421223 is an apocalyptic number.

20404421223 is a deficient number, since it is larger than the sum of its proper divisors (6902611977).

20404421223 is a wasteful number, since it uses less digits than its factorization.

20404421223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25284561.

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 20404421223 its reverse (32212440402), we get a palindrome (52616861625).

The spelling of 20404421223 in words is "twenty billion, four hundred four million, four hundred twenty-one thousand, two hundred twenty-three".