20173993 has 12 divisors (see below), whose sum is σ = 23470720. Its totient is φ = 16983720.

The previous prime is 20173969. The next prime is 20173997. The reversal of 20173993 is 39937102.

It is not a de Polignac number, because 20173993 - 2¹³ = 20165801 is a prime.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (20173997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 105528 + ... + 105718.

Almost surely, 2^20173993 is an apocalyptic number.

It is an amenable number.

20173993 is a deficient number, since it is larger than the sum of its proper divisors (3296727).

20173993 is an frugal number, since it uses more digits than its factorization.

20173993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468 (or 277 counting only the distinct ones).

The product of its (nonzero) digits is 10206, while the sum is 34.

The square root of 20173993 is about 4491.5468382285. The cubic root of 20173993 is about 272.2266394273.

The spelling of 20173993 in words is "twenty million, one hundred seventy-three thousand, nine hundred ninety-three".