20269289 has 8 divisors (see below), whose sum is σ = 21020160. Its totient is φ = 19521936.

The previous prime is 20269283. The next prime is 20269307. The reversal of 20269289 is 98296202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20269289 - 2⁸ = 20269033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20269283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18104 + ... + 19190.

It is an arithmetic number, because the mean of its divisors is an integer number (2627520).

Almost surely, 2^20269289 is an apocalyptic number.

20269289 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

20269289 is a deficient number, since it is larger than the sum of its proper divisors (750871).

20269289 is a wasteful number, since it uses less digits than its factorization.

20269289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1759.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 20269289 is about 4502.1427120872. The cubic root of 20269289 is about 272.6546057544.

The spelling of 20269289 in words is "twenty million, two hundred sixty-nine thousand, two hundred eighty-nine".