19804980 has 48 divisors (see below), whose sum is σ = 59721984. Its totient is φ = 4874880.

The previous prime is 19804979. The next prime is 19804991. The reversal of 19804980 is 8940891.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11916 + ... + 13475.

It is an arithmetic number, because the mean of its divisors is an integer number (1244208).

Almost surely, 2^19804980 is an apocalyptic number.

19804980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19804980 is an abundant number, since it is smaller than the sum of its proper divisors (39917004).

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

19804980 is a wasteful number, since it uses less digits than its factorization.

19804980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25416 (or 25414 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 19804980 is about 4450.2786429616. The cubic root of 19804980 is about 270.5566021251.

The spelling of 19804980 in words is "nineteen million, eight hundred four thousand, nine hundred eighty".