19780470 has 64 divisors (see below), whose sum is σ = 53657280. Its totient is φ = 5184000.

The previous prime is 19780457. The next prime is 19780487. The reversal of 19780470 is 7408791.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15870 + ... + 17070.

It is an arithmetic number, because the mean of its divisors is an integer number (838395).

Almost surely, 2^19780470 is an apocalyptic number.

19780470 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19780470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26828640).

19780470 is an abundant number, since it is smaller than the sum of its proper divisors (33876810).

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

19780470 is a wasteful number, since it uses less digits than its factorization.

19780470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278 (or 1272 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 19780470 is about 4447.5240302892. The cubic root of 19780470 is about 270.4449453637. Note that the first 3 decimals are identical.

The spelling of 19780470 in words is "nineteen million, seven hundred eighty thousand, four hundred seventy".