19782780 has 48 divisors (see below), whose sum is σ = 56445984. Its totient is φ = 5175040.

The previous prime is 19782779. The next prime is 19782793. The reversal of 19782780 is 8728791.

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, 70 + ... + 6290.

It is an arithmetic number, because the mean of its divisors is an integer number (1175958).

Almost surely, 2^19782780 is an apocalyptic number.

19782780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19782780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28222992).

19782780 is an abundant number, since it is smaller than the sum of its proper divisors (36663204).

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

19782780 is a wasteful number, since it uses less digits than its factorization.

19782780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6286 (or 6284 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 42.

The square root of 19782780 is about 4447.7837177633. The cubic root of 19782780 is about 270.4554726415.

The spelling of 19782780 in words is "nineteen million, seven hundred eighty-two thousand, seven hundred eighty".