20022689 has 2 divisors, whose sum is σ = 20022690. Its totient is φ = 20022688.

The previous prime is 20022677. The next prime is 20022707. The reversal of 20022689 is 98622002.

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., 16443025 + 3579664 = 4055^2 + 1892^2 .

It is a cyclic number.

It is not a de Polignac number, because 20022689 - 2¹⁶ = 19957153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20022619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10011344 + 10011345.

It is an arithmetic number, because the mean of its divisors is an integer number (10011345).

Almost surely, 2^20022689 is an apocalyptic number.

It is an amenable number.

20022689 is a deficient number, since it is larger than the sum of its proper divisors (1).

20022689 is an equidigital number, since it uses as much as digits as its factorization.

20022689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 20022689 is about 4474.6719432825. The cubic root of 20022689 is about 271.5443685706.

The spelling of 20022689 in words is "twenty million, twenty-two thousand, six hundred eighty-nine".