19880740 has 48 divisors (see below), whose sum is σ = 47537280. Its totient is φ = 6913280.

The previous prime is 19880723. The next prime is 19880759. The reversal of 19880740 is 4708891.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 19880740.

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 15 ways as a sum of consecutive naturals, for example, 3096 + ... + 7024.

It is an arithmetic number, because the mean of its divisors is an integer number (990360).

Almost surely, 2^19880740 is an apocalyptic number.

19880740 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 19880740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23768640).

19880740 is an abundant number, since it is smaller than the sum of its proper divisors (27656540).

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

19880740 is a wasteful number, since it uses less digits than its factorization.

19880740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3972 (or 3970 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 19880740 is about 4458.7823449906. The cubic root of 19880740 is about 270.9011499338.

The spelling of 19880740 in words is "nineteen million, eight hundred eighty thousand, seven hundred forty".