20282221 has 2 divisors, whose sum is σ = 20282222. Its totient is φ = 20282220.

The previous prime is 20282209. The next prime is 20282231. The reversal of 20282221 is 12228202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18361225 + 1920996 = 4285^2 + 1386^2 .

It is a cyclic number.

It is not a de Polignac number, because 20282221 - 2⁵ = 20282189 is a prime.

It is a super-2 number, since 2×20282221² = 822736977385682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20282231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10141110 + 10141111.

It is an arithmetic number, because the mean of its divisors is an integer number (10141111).

Almost surely, 2^20282221 is an apocalyptic number.

It is an amenable number.

20282221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20282221 is an equidigital number, since it uses as much as digits as its factorization.

20282221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 20282221 is about 4503.5786881102. The cubic root of 20282221 is about 272.7125788413.

It can be divided in two parts, 20282 and 221, that added together give a triangular number (20503 = T₂₀₂).

The spelling of 20282221 in words is "twenty million, two hundred eighty-two thousand, two hundred twenty-one".