19780830 has 24 divisors (see below), whose sum is σ = 51430392. Its totient is φ = 5274864.

The previous prime is 19780781. The next prime is 19780837. The reversal of 19780830 is 3808791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19780837) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 109804 + ... + 109983.

It is an arithmetic number, because the mean of its divisors is an integer number (2142933).

Almost surely, 2^19780830 is an apocalyptic number.

19780830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19780830 is an abundant number, since it is smaller than the sum of its proper divisors (31649562).

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

19780830 is a wasteful number, since it uses less digits than its factorization.

19780830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219800 (or 219797 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 19780830 is about 4447.5645020618. The cubic root of 19780830 is about 270.4465860324.

The spelling of 19780830 in words is "nineteen million, seven hundred eighty thousand, eight hundred thirty".