20880221 has 8 divisors (see below), whose sum is σ = 22149600. Its totient is φ = 19627920.

The previous prime is 20880191. The next prime is 20880257. The reversal of 20880221 is 12208802.

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

It is a cyclic number.

It is not a de Polignac number, because 20880221 - 2¹⁸ = 20618077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20880271) 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, 1706 + ... + 6683.

It is an arithmetic number, because the mean of its divisors is an integer number (2768700).

Almost surely, 2^20880221 is an apocalyptic number.

It is an amenable number.

20880221 is a deficient number, since it is larger than the sum of its proper divisors (1269379).

20880221 is a wasteful number, since it uses less digits than its factorization.

20880221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8539.

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 20880221 is about 4569.4880457224. The cubic root of 20880221 is about 275.3668756253.

The spelling of 20880221 in words is "twenty million, eight hundred eighty thousand, two hundred twenty-one".