20172994 has 8 divisors (see below), whose sum is σ = 30294288. Its totient is φ = 10074900.

The previous prime is 20172989. The next prime is 20173051. The reversal of 20172994 is 49927102.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3432 + ... + 7219.

It is an arithmetic number, because the mean of its divisors is an integer number (3786786).

Almost surely, 2^20172994 is an apocalyptic number.

20172994 is a deficient number, since it is larger than the sum of its proper divisors (10121294).

20172994 is a wasteful number, since it uses less digits than its factorization.

20172994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11600.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 20172994 is about 4491.4356279479. The cubic root of 20172994 is about 272.2221458713. Note that the first 3 decimals are identical.

The spelling of 20172994 in words is "twenty million, one hundred seventy-two thousand, nine hundred ninety-four".