20001066 has 8 divisors (see below), whose sum is σ = 40002144. Its totient is φ = 6667020.

The previous prime is 20001031. The next prime is 20001067. The reversal of 20001066 is 66010002.

It is a sphenic number, since it is the product of 3 distinct primes.

20001066 is an admirable number.

It is a super-2 number, since 2×20001066² = 800085282272712, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20001067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1666750 + ... + 1666761.

It is an arithmetic number, because the mean of its divisors is an integer number (5000268).

Almost surely, 2^20001066 is an apocalyptic number.

20001066 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20001066 is a wasteful number, since it uses less digits than its factorization.

20001066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3333516.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 20001066 is about 4472.2551358347. The cubic root of 20001066 is about 271.4465841891.

Adding to 20001066 its reverse (66010002), we get a palindrome (86011068).

The spelling of 20001066 in words is "twenty million, one thousand, sixty-six".