20021366 has 16 divisors (see below), whose sum is σ = 31600800. Its totient is φ = 9501120.

The previous prime is 20021363. The next prime is 20021369. The reversal of 20021366 is 66312002.

It is an interprime number because it is at equal distance from previous prime (20021363) and next prime (20021369).

It is a super-3 number, since 3×20021366³ (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 (20021363) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 266 + ... + 6333.

It is an arithmetic number, because the mean of its divisors is an integer number (1975050).

Almost surely, 2^20021366 is an apocalyptic number.

20021366 is a deficient number, since it is larger than the sum of its proper divisors (11579434).

20021366 is a wasteful number, since it uses less digits than its factorization.

20021366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6679.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 20021366 is about 4474.5241087740. The cubic root of 20021366 is about 271.5383876705.

Adding to 20021366 its reverse (66312002), we get a palindrome (86333368).

The spelling of 20021366 in words is "twenty million, twenty-one thousand, three hundred sixty-six".