20247066 has 96 divisors (see below), whose sum is σ = 53209728. Its totient is φ = 5443200.

The previous prime is 20247053. The next prime is 20247067. The reversal of 20247066 is 66074202.

20247066 is a nontrivial binomial coefficient, being equal to C(6364, 2).

It is a super-3 number, since 3×20247066³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20247067) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 200416 + ... + 200516.

It is an arithmetic number, because the mean of its divisors is an integer number (554268).

Almost surely, 2^20247066 is an apocalyptic number.

20247066 is the 6363-rd triangular number and also the 3182-nd hexagonal number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20247066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26604864).

20247066 is an abundant number, since it is smaller than the sum of its proper divisors (32962662).

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

20247066 is a wasteful number, since it uses less digits than its factorization.

20247066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196 (or 193 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 20247066 is about 4499.6739881907. The cubic root of 20247066 is about 272.5549242598.

The spelling of 20247066 in words is "twenty million, two hundred forty-seven thousand, sixty-six".