20109994 has 4 divisors (see below), whose sum is σ = 30164994. Its totient is φ = 10054996.

The previous prime is 20109989. The next prime is 20110043. The reversal of 20109994 is 49990102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17264025 + 2845969 = 4155^2 + 1687^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5027497 + ... + 5027500.

Almost surely, 2^20109994 is an apocalyptic number.

20109994 is a deficient number, since it is larger than the sum of its proper divisors (10055000).

20109994 is a wasteful number, since it uses less digits than its factorization.

20109994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10054999.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 20109994 is about 4484.4167959725. The cubic root of 20109994 is about 271.9384682757.

The spelling of 20109994 in words is "twenty million, one hundred nine thousand, nine hundred ninety-four".