19678780 has 24 divisors (see below), whose sum is σ = 45082800. Its totient is φ = 7155840.

The previous prime is 19678721. The next prime is 19678781. The reversal of 19678780 is 8787691.

It is a self number, because there is not a number n which added to its sum of digits gives 19678780.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19678781) 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, 44505 + ... + 44944.

It is an arithmetic number, because the mean of its divisors is an integer number (1878450).

Almost surely, 2^19678780 is an apocalyptic number.

19678780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19678780 is an abundant number, since it is smaller than the sum of its proper divisors (25404020).

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

19678780 is a wasteful number, since it uses less digits than its factorization.

19678780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89469 (or 89467 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 46.

The square root of 19678780 is about 4436.0770958134. The cubic root of 19678780 is about 269.9807027818.

The spelling of 19678780 in words is "nineteen million, six hundred seventy-eight thousand, seven hundred eighty".