19500990 has 32 divisors (see below), whose sum is σ = 47264256. Its totient is φ = 5148960.

The previous prime is 19500983. The next prime is 19501003. The reversal of 19500990 is 9900591.

It is a super-2 number, since 2×19500990² = 760577221960200, which contains 22 as substring.

It is a Curzon number.

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, 66 + ... + 6245.

It is an arithmetic number, because the mean of its divisors is an integer number (1477008).

Almost surely, 2^19500990 is an apocalyptic number.

19500990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19500990 is an abundant number, since it is smaller than the sum of its proper divisors (27763266).

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

19500990 is a wasteful number, since it uses less digits than its factorization.

19500990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6424.

The product of its (nonzero) digits is 3645, while the sum is 33.

The square root of 19500990 is about 4415.9925271676. The cubic root of 19500990 is about 269.1651855533.

The spelling of 19500990 in words is "nineteen million, five hundred thousand, nine hundred ninety".