19920966 has 32 divisors (see below), whose sum is σ = 43266048. Its totient is φ = 6078240.

The previous prime is 19920947. The next prime is 19920973. The reversal of 19920966 is 66902991.

It is a happy number.

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, 8901 + ... + 10911.

It is an arithmetic number, because the mean of its divisors is an integer number (1352064).

Almost surely, 2^19920966 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19920966, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21633024).

19920966 is an abundant number, since it is smaller than the sum of its proper divisors (23345082).

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

19920966 is a wasteful number, since it uses less digits than its factorization.

19920966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2156.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 19920966 is about 4463.2909383100. The cubic root of 19920966 is about 271.0837375067.

The spelling of 19920966 in words is "nineteen million, nine hundred twenty thousand, nine hundred sixty-six".