19994780 has 48 divisors (see below), whose sum is σ = 46103904. Its totient is φ = 7238400.

The previous prime is 19994761. The next prime is 19994789. The reversal of 19994780 is 8749991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19994789) 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, 13055 + ... + 14505.

It is an arithmetic number, because the mean of its divisors is an integer number (960498).

Almost surely, 2^19994780 is an apocalyptic number.

19994780 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 19994780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23051952).

19994780 is an abundant number, since it is smaller than the sum of its proper divisors (26109124).

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

19994780 is a wasteful number, since it uses less digits than its factorization.

19994780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1526 (or 1524 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 19994780 is about 4471.5523031717. The cubic root of 19994780 is about 271.4181441714.

The spelling of 19994780 in words is "nineteen million, nine hundred ninety-four thousand, seven hundred eighty".