20404421999 has 16 divisors (see below), whose sum is σ = 22355760000. Its totient is φ = 18507890016.

The previous prime is 20404421987. The next prime is 20404422007. The reversal of 20404421999 is 99912440402.

It is a cyclic number.

It is not a de Polignac number, because 20404421999 - 2¹² = 20404417903 is a prime.

It is a super-2 number, since 2×20404421999² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404421909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2679932 + ... + 2687534.

It is an arithmetic number, because the mean of its divisors is an integer number (1397235000).

Almost surely, 2^20404421999 is an apocalyptic number.

20404421999 is a deficient number, since it is larger than the sum of its proper divisors (1951338001).

20404421999 is a wasteful number, since it uses less digits than its factorization.

20404421999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11174.

The product of its (nonzero) digits is 186624, while the sum is 44.

The spelling of 20404421999 in words is "twenty billion, four hundred four million, four hundred twenty-one thousand, nine hundred ninety-nine".