19664106 has 64 divisors (see below), whose sum is σ = 50651136. Its totient is φ = 4939200.

The previous prime is 19664101. The next prime is 19664123. The reversal of 19664106 is 60146691.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (19664101) 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 31 ways as a sum of consecutive naturals, for example, 13636 + ... + 15008.

It is an arithmetic number, because the mean of its divisors is an integer number (791424).

Almost surely, 2^19664106 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19664106, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25325568).

19664106 is an abundant number, since it is smaller than the sum of its proper divisors (30987030).

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

19664106 is a wasteful number, since it uses less digits than its factorization.

19664106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1427.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 19664106 is about 4434.4228485791. The cubic root of 19664106 is about 269.9135800239.

The spelling of 19664106 in words is "nineteen million, six hundred sixty-four thousand, one hundred six".