19789980 has 48 divisors (see below), whose sum is σ = 63329280. Its totient is φ = 4523328.

The previous prime is 19789969. The next prime is 19789981. The reversal of 19789980 is 8998791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19789981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23140 + ... + 23979.

It is an arithmetic number, because the mean of its divisors is an integer number (1319360).

Almost surely, 2^19789980 is an apocalyptic number.

19789980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19789980 is an abundant number, since it is smaller than the sum of its proper divisors (43539300).

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

19789980 is a wasteful number, since it uses less digits than its factorization.

19789980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47138 (or 47136 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 51.

The square root of 19789980 is about 4448.5930360059. The cubic root of 19789980 is about 270.4882796789.

The spelling of 19789980 in words is "nineteen million, seven hundred eighty-nine thousand, nine hundred eighty".