20199490 has 16 divisors (see below), whose sum is σ = 36416952. Its totient is φ = 8066944.

The previous prime is 20199481. The next prime is 20199493. The reversal of 20199490 is 9499102.

It can be written as a sum of positive squares in 4 ways, for example, as 17413929 + 2785561 = 4173^2 + 1669^2 .

It is not an unprimeable number, because it can be changed into a prime (20199493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7392 + ... + 9748.

Almost surely, 2^20199490 is an apocalyptic number.

20199490 is a deficient number, since it is larger than the sum of its proper divisors (16217462).

20199490 is a wasteful number, since it uses less digits than its factorization.

20199490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3221.

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

The square root of 20199490 is about 4494.3842737354. The cubic root of 20199490 is about 272.3412761373.

The spelling of 20199490 in words is "twenty million, one hundred ninety-nine thousand, four hundred ninety".