20394999 has 24 divisors (see below), whose sum is σ = 31777200. Its totient is φ = 12562560.

The previous prime is 20394991. The next prime is 20395003. The reversal of 20394999 is 99949302.

It is not a de Polignac number, because 20394999 - 2³ = 20394991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20394991) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 5557 + ... + 8465.

It is an arithmetic number, because the mean of its divisors is an integer number (1324050).

Almost surely, 2^20394999 is an apocalyptic number.

20394999 is a deficient number, since it is larger than the sum of its proper divisors (11382201).

20394999 is a wasteful number, since it uses less digits than its factorization.

20394999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2975 (or 2972 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 45.

The square root of 20394999 is about 4516.0822623154. The cubic root of 20394999 is about 273.2171118362.

The spelling of 20394999 in words is "twenty million, three hundred ninety-four thousand, nine hundred ninety-nine".