20633489 has 2 divisors, whose sum is σ = 20633490. Its totient is φ = 20633488.

The previous prime is 20633447. The next prime is 20633491. The reversal of 20633489 is 98433602.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19509889 + 1123600 = 4417^2 + 1060^2 .

It is a cyclic number.

It is not a de Polignac number, because 20633489 - 2²⁰ = 19584913 is a prime.

Together with 20633491, 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 (20633419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10316744 + 10316745.

It is an arithmetic number, because the mean of its divisors is an integer number (10316745).

Almost surely, 2^20633489 is an apocalyptic number.

It is an amenable number.

20633489 is a deficient number, since it is larger than the sum of its proper divisors (1).

20633489 is an equidigital number, since it uses as much as digits as its factorization.

20633489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 20633489 is about 4542.4100431379. The cubic root of 20633489 is about 274.2779471258.

The spelling of 20633489 in words is "twenty million, six hundred thirty-three thousand, four hundred eighty-nine".