20784066 has 16 divisors (see below), whose sum is σ = 41749344. Its totient is φ = 6897824.

The previous prime is 20784041. The next prime is 20784077. The reversal of 20784066 is 66048702.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6036 + ... + 8831.

It is an arithmetic number, because the mean of its divisors is an integer number (2609334).

Almost surely, 2^20784066 is an apocalyptic number.

20784066 is an abundant number, since it is smaller than the sum of its proper divisors (20965278).

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

20784066 is a wasteful number, since it uses less digits than its factorization.

20784066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15105.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 20784066 is about 4558.9544854056. The cubic root of 20784066 is about 274.9435300027.

The spelling of 20784066 in words is "twenty million, seven hundred eighty-four thousand, sixty-six".