22006139904 has 198 divisors, whose sum is σ = 73918013364. Its totient is φ = 6287339520.

The previous prime is 22006139899. The next prime is 22006139941. The reversal of 22006139904 is 40993160022.

22006139904 is a `hidden beast` number, since 2 + 200 + 61 + 399 + 0 + 4 = 666.

It is a super-2 number, since 2×22006139904² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 427219 + ... + 475949.

Almost surely, 2^22006139904 is an apocalyptic number.

22006139904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22006139904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36959006682).

22006139904 is an abundant number, since it is smaller than the sum of its proper divisors (51911873460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22006139904 is a wasteful number, since it uses less digits than its factorization.

22006139904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48771 (or 48743 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

Adding to 22006139904 its reverse (40993160022), we get a palindrome (62999299926).

The spelling of 22006139904 in words is "twenty-two billion, six million, one hundred thirty-nine thousand, nine hundred four".