19949980 has 24 divisors (see below), whose sum is σ = 42078960. Its totient is φ = 7944960.

The previous prime is 19949977. The next prime is 19950013. The reversal of 19949980 is 8994991.

It is a congruent number.

It is an unprimeable number.

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, 2751 + ... + 6889.

It is an arithmetic number, because the mean of its divisors is an integer number (1753290).

Almost surely, 2^19949980 is an apocalyptic number.

19949980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19949980 is an abundant number, since it is smaller than the sum of its proper divisors (22128980).

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

19949980 is a wasteful number, since it uses less digits than its factorization.

19949980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4389 (or 4387 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 49.

The square root of 19949980 is about 4466.5400479566. The cubic root of 19949980 is about 271.2152807962.

The spelling of 19949980 in words is "nineteen million, nine hundred forty-nine thousand, nine hundred eighty".