19990320 has 160 divisors (see below), whose sum is σ = 72233472. Its totient is φ = 4478976.

The previous prime is 19990307. The next prime is 19990349. The reversal of 19990320 is 2309991.

It is a super-2 number, since 2×19990320² = 799225787404800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 122559 + ... + 122721.

Almost surely, 2^19990320 is an apocalyptic number.

19990320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19990320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36116736).

19990320 is an abundant number, since it is smaller than the sum of its proper divisors (52243152).

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

19990320 is a wasteful number, since it uses less digits than its factorization.

19990320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259 (or 253 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 33.

The square root of 19990320 is about 4471.0535671137. The cubic root of 19990320 is about 271.3979619882.

The spelling of 19990320 in words is "nineteen million, nine hundred ninety thousand, three hundred twenty".