19820190 has 32 divisors (see below), whose sum is σ = 51228576. Its totient is φ = 4878720.

The previous prime is 19820167. The next prime is 19820219. The reversal of 19820190 is 9102891.

It is a super-2 number, since 2×19820190² = 785679863272200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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

It is a congruent number.

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, 25021 + ... + 25800.

It is an arithmetic number, because the mean of its divisors is an integer number (1600893).

Almost surely, 2^19820190 is an apocalyptic number.

19820190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19820190 is an abundant number, since it is smaller than the sum of its proper divisors (31408386).

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

19820190 is a wasteful number, since it uses less digits than its factorization.

19820190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50844.

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 19820190 is about 4451.9871967471. The cubic root of 19820190 is about 270.6258458692.

The spelling of 19820190 in words is "nineteen million, eight hundred twenty thousand, one hundred ninety".