20066221 has 4 divisors (see below), whose sum is σ = 22932832. Its totient is φ = 17199612.

The previous prime is 20066197. The next prime is 20066243. The reversal of 20066221 is 12266002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20066221 - 2¹¹ = 20064173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20066821) 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, 1433295 + ... + 1433308.

It is an arithmetic number, because the mean of its divisors is an integer number (5733208).

Almost surely, 2^20066221 is an apocalyptic number.

It is an amenable number.

20066221 is a deficient number, since it is larger than the sum of its proper divisors (2866611).

20066221 is an equidigital number, since it uses as much as digits as its factorization.

20066221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2866610.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 20066221 is about 4479.5335694690. The cubic root of 20066221 is about 271.7410173669.

The spelling of 20066221 in words is "twenty million, sixty-six thousand, two hundred twenty-one".