19983280 has 40 divisors (see below), whose sum is σ = 46648800. Its totient is φ = 7961088.

The previous prime is 19983247. The next prime is 19983281. The reversal of 19983280 is 8238991.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19983281) 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, 34836 + ... + 35404.

It is an arithmetic number, because the mean of its divisors is an integer number (1166220).

Almost surely, 2^19983280 is an apocalyptic number.

19983280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19983280 is an abundant number, since it is smaller than the sum of its proper divisors (26665520).

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

19983280 is a wasteful number, since it uses less digits than its factorization.

19983280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021 (or 1015 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 19983280 is about 4470.2662113123. The cubic root of 19983280 is about 271.3660987999.

The spelling of 19983280 in words is "nineteen million, nine hundred eighty-three thousand, two hundred eighty".