20994424173 has 12 divisors (see below), whose sum is σ = 31643770080. Its totient is φ = 13387748616.

The previous prime is 20994424151. The next prime is 20994424177. The reversal of 20994424173 is 37142449902.

20994424173 is a `hidden beast` number, since 209 + 9 + 4 + 424 + 17 + 3 = 666.

It is not a de Polignac number, because 20994424173 - 2²⁰ = 20993375597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20994424177) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50710963 + ... + 50711376.

It is an arithmetic number, because the mean of its divisors is an integer number (2636980840).

Almost surely, 2^20994424173 is an apocalyptic number.

20994424173 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20994424173 is a deficient number, since it is larger than the sum of its proper divisors (10649345907).

20994424173 is a wasteful number, since it uses less digits than its factorization.

20994424173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101422368 (or 101422365 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The spelling of 20994424173 in words is "twenty billion, nine hundred ninety-four million, four hundred twenty-four thousand, one hundred seventy-three".