19764966 has 32 divisors (see below), whose sum is σ = 42900480. Its totient is φ = 6034464.

The previous prime is 19764947. The next prime is 19764971. The reversal of 19764966 is 66946791.

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, 9931 + ... + 11753.

It is an arithmetic number, because the mean of its divisors is an integer number (1340640).

Almost surely, 2^19764966 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19764966, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21450240).

19764966 is an abundant number, since it is smaller than the sum of its proper divisors (23135514).

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

19764966 is a wasteful number, since it uses less digits than its factorization.

19764966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1980.

The product of its digits is 489888, while the sum is 48.

The square root of 19764966 is about 4445.7806963457. The cubic root of 19764966 is about 270.3742683373.

The spelling of 19764966 in words is "nineteen million, seven hundred sixty-four thousand, nine hundred sixty-six".