19799920 has 60 divisors (see below), whose sum is σ = 53561304. Its totient is φ = 6787200.

The previous prime is 19799911. The next prime is 19799933. The reversal of 19799920 is 2999791.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1395 + ... + 6445.

Almost surely, 2^19799920 is an apocalyptic number.

19799920 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 19799920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26780652).

19799920 is an abundant number, since it is smaller than the sum of its proper divisors (33761384).

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

19799920 is a wasteful number, since it uses less digits than its factorization.

19799920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5078 (or 5065 counting only the distinct ones).

The product of its (nonzero) digits is 91854, while the sum is 46.

The square root of 19799920 is about 4449.7101029168. The cubic root of 19799920 is about 270.5335585436.

The spelling of 19799920 in words is "nineteen million, seven hundred ninety-nine thousand, nine hundred twenty".