20173189940 has 24 divisors (see below), whose sum is σ = 42479146752. Its totient is φ = 8047285920.

The previous prime is 20173189909. The next prime is 20173189963. The reversal of 20173189940 is 4998137102.

It is a junction number, because it is equal to n+sod(n) for n = 20173189891 and 20173189900.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1366856 + ... + 1381535.

It is an arithmetic number, because the mean of its divisors is an integer number (1769964448).

Almost surely, 2^20173189940 is an apocalyptic number.

20173189940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20173189940 is an abundant number, since it is smaller than the sum of its proper divisors (22305956812).

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

20173189940 is a wasteful number, since it uses less digits than its factorization.

20173189940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2748767 (or 2748765 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 44.

The spelling of 20173189940 in words is "twenty billion, one hundred seventy-three million, one hundred eighty-nine thousand, nine hundred forty".