19986980 has 24 divisors (see below), whose sum is σ = 45201912. Its totient is φ = 7379712.

The previous prime is 19986943. The next prime is 19986983. The reversal of 19986980 is 8968991.

It can be written as a sum of positive squares in 4 ways, for example, as 4194304 + 15792676 = 2048^2 + 3974^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19986983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38177 + ... + 38696.

It is an arithmetic number, because the mean of its divisors is an integer number (1883413).

Almost surely, 2^19986980 is an apocalyptic number.

19986980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19986980 is an abundant number, since it is smaller than the sum of its proper divisors (25214932).

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

19986980 is a wasteful number, since it uses less digits than its factorization.

19986980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76895 (or 76893 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 50.

The square root of 19986980 is about 4470.6800377571. The cubic root of 19986980 is about 271.3828460107.

The spelling of 19986980 in words is "nineteen million, nine hundred eighty-six thousand, nine hundred eighty".