20435489 has 2 divisors, whose sum is σ = 20435490. Its totient is φ = 20435488.

The previous prime is 20435447. The next prime is 20435491. The reversal of 20435489 is 98453402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10291264 + 10144225 = 3208^2 + 3185^2 .

It is a cyclic number.

It is not a de Polignac number, because 20435489 - 2¹⁶ = 20369953 is a prime.

Together with 20435491, 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 (20435689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10217744 + 10217745.

It is an arithmetic number, because the mean of its divisors is an integer number (10217745).

Almost surely, 2^20435489 is an apocalyptic number.

It is an amenable number.

20435489 is a deficient number, since it is larger than the sum of its proper divisors (1).

20435489 is an equidigital number, since it uses as much as digits as its factorization.

20435489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 20435489 is about 4520.5629074265. The cubic root of 20435489 is about 273.3977974399.

The spelling of 20435489 in words is "twenty million, four hundred thirty-five thousand, four hundred eighty-nine".