19813980 has 24 divisors (see below), whose sum is σ = 55479312. Its totient is φ = 5283712.

The previous prime is 19813967. The next prime is 19813987. The reversal of 19813980 is 8931891.

It is a happy number.

It is a super-3 number, since 3×19813980³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19813987) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 165057 + ... + 165176.

It is an arithmetic number, because the mean of its divisors is an integer number (2311638).

Almost surely, 2^19813980 is an apocalyptic number.

19813980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19813980 is an abundant number, since it is smaller than the sum of its proper divisors (35665332).

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

19813980 is a wasteful number, since it uses less digits than its factorization.

19813980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330245 (or 330243 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 39.

The square root of 19813980 is about 4451.2897007497. The cubic root of 19813980 is about 270.5975790354.

The spelling of 19813980 in words is "nineteen million, eight hundred thirteen thousand, nine hundred eighty".