19980440 has 32 divisors (see below), whose sum is σ = 47602080. Its totient is φ = 7521792.

The previous prime is 19980437. The next prime is 19980451. The reversal of 19980440 is 4408991.

It is a self number, because there is not a number n which added to its sum of digits gives 19980440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14012 + ... + 15371.

It is an arithmetic number, because the mean of its divisors is an integer number (1487565).

Almost surely, 2^19980440 is an apocalyptic number.

19980440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19980440 is an abundant number, since it is smaller than the sum of its proper divisors (27621640).

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

19980440 is a wasteful number, since it uses less digits than its factorization.

19980440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29411 (or 29407 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 19980440 is about 4469.9485455652. The cubic root of 19980440 is about 271.3532427818.

The spelling of 19980440 in words is "nineteen million, nine hundred eighty thousand, four hundred forty".