20199090 has 32 divisors (see below), whose sum is σ = 51030720. Its totient is φ = 5102784.

The previous prime is 20199079. The next prime is 20199103. The reversal of 20199090 is 9099102.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17149 + ... + 18288.

It is an arithmetic number, because the mean of its divisors is an integer number (1594710).

Almost surely, 2^20199090 is an apocalyptic number.

20199090 is an abundant number, since it is smaller than the sum of its proper divisors (30831630).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20199090 is a wasteful number, since it uses less digits than its factorization.

20199090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35466.

The product of its (nonzero) digits is 1458, while the sum is 30.

The square root of 20199090 is about 4494.3397735374. The cubic root of 20199090 is about 272.3394784478.

The spelling of 20199090 in words is "twenty million, one hundred ninety-nine thousand, ninety".