19989220 has 24 divisors (see below), whose sum is σ = 42081984. Its totient is φ = 7975776.

The previous prime is 19989217. The next prime is 19989223. The reversal of 19989220 is 2298991.

It is an interprime number because it is at equal distance from previous prime (19989217) and next prime (19989223).

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (19989223) 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, 9067 + ... + 11053.

It is an arithmetic number, because the mean of its divisors is an integer number (1753416).

Almost surely, 2^19989220 is an apocalyptic number.

19989220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19989220 is an abundant number, since it is smaller than the sum of its proper divisors (22092764).

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

19989220 is a wasteful number, since it uses less digits than its factorization.

19989220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2499 (or 2497 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 19989220 is about 4470.9305519097. The cubic root of 19989220 is about 271.3929838582.

The spelling of 19989220 in words is "nineteen million, nine hundred eighty-nine thousand, two hundred twenty".