19799720 has 32 divisors (see below), whose sum is σ = 45639720. Its totient is φ = 7726080.

The previous prime is 19799707. The next prime is 19799723. The reversal of 19799720 is 2799791.

It can be written as a sum of positive squares in 4 ways, for example, as 4605316 + 15194404 = 2146^2 + 3898^2 .

It is not an unprimeable number, because it can be changed into a prime (19799723) 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, 4397 + ... + 7676.

Almost surely, 2^19799720 is an apocalyptic number.

19799720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19799720 is an abundant number, since it is smaller than the sum of its proper divisors (25840000).

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

19799720 is a wasteful number, since it uses less digits than its factorization.

19799720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12125 (or 12121 counting only the distinct ones).

The product of its (nonzero) digits is 71442, while the sum is 44.

The square root of 19799720 is about 4449.6876294859. The cubic root of 19799720 is about 270.5326476494.

The spelling of 19799720 in words is "nineteen million, seven hundred ninety-nine thousand, seven hundred twenty".