20880281 has 2 divisors, whose sum is σ = 20880282. Its totient is φ = 20880280.

The previous prime is 20880271. The next prime is 20880283. The reversal of 20880281 is 18208802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11669056 + 9211225 = 3416^2 + 3035^2 .

It is a cyclic number.

It is not a de Polignac number, because 20880281 - 2¹⁴ = 20863897 is a prime.

It is a super-2 number, since 2×20880281² = 871972269277922, which contains 22 as substring.

Together with 20880283, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20880283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10440140 + 10440141.

It is an arithmetic number, because the mean of its divisors is an integer number (10440141).

Almost surely, 2^20880281 is an apocalyptic number.

It is an amenable number.

20880281 is a deficient number, since it is larger than the sum of its proper divisors (1).

20880281 is an equidigital number, since it uses as much as digits as its factorization.

20880281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2048, while the sum is 29.

The square root of 20880281 is about 4569.4946110046. The cubic root of 20880281 is about 275.3671393837.

The spelling of 20880281 in words is "twenty million, eight hundred eighty thousand, two hundred eighty-one".