20632889 has 2 divisors, whose sum is σ = 20632890. Its totient is φ = 20632888.

The previous prime is 20632877. The next prime is 20632919. The reversal of 20632889 is 98823602.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15342889 + 5290000 = 3917^2 + 2300^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20632889 is a prime.

It is a super-2 number, since 2×20632889² = 851432216972642, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20632189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10316444 + 10316445.

It is an arithmetic number, because the mean of its divisors is an integer number (10316445).

Almost surely, 2^20632889 is an apocalyptic number.

It is an amenable number.

20632889 is a deficient number, since it is larger than the sum of its proper divisors (1).

20632889 is an equidigital number, since it uses as much as digits as its factorization.

20632889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 20632889 is about 4542.3439984220. The cubic root of 20632889 is about 274.2752885293.

The spelling of 20632889 in words is "twenty million, six hundred thirty-two thousand, eight hundred eighty-nine".