19666480 has 40 divisors (see below), whose sum is σ = 46796112. Its totient is φ = 7682304.

The previous prime is 19666469. The next prime is 19666483. The reversal of 19666480 is 8466691.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (19666483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 582 + ... + 6298.

Almost surely, 2^19666480 is an apocalyptic number.

19666480 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 19666480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23398056).

19666480 is an abundant number, since it is smaller than the sum of its proper divisors (27129632).

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

19666480 is a wasteful number, since it uses less digits than its factorization.

19666480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5773 (or 5767 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 19666480 is about 4434.6905190780. The cubic root of 19666480 is about 269.9244415916.

The spelling of 19666480 in words is "nineteen million, six hundred sixty-six thousand, four hundred eighty".