20404023421 has 8 divisors (see below), whose sum is σ = 20713825440. Its totient is φ = 20094376368.

The previous prime is 20404023397. The next prime is 20404023457. The reversal of 20404023421 is 12432040402.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20404023421 - 2¹⁵ = 20403990653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20404023392 and 20404023401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404023461) 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, 241890 + ... + 315148.

It is an arithmetic number, because the mean of its divisors is an integer number (2589228180).

Almost surely, 2^20404023421 is an apocalyptic number.

It is an amenable number.

20404023421 is a deficient number, since it is larger than the sum of its proper divisors (309802019).

20404023421 is an equidigital number, since it uses as much as digits as its factorization.

20404023421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77483.

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

Adding to 20404023421 its reverse (12432040402), we get a palindrome (32836063823).

The spelling of 20404023421 in words is "twenty billion, four hundred four million, twenty-three thousand, four hundred twenty-one".