20289311 has 8 divisors (see below), whose sum is σ = 23215104. Its totient is φ = 17370360.

The previous prime is 20289293. The next prime is 20289317. The reversal of 20289311 is 11398202.

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

It is a de Polignac number, because none of the positive numbers 2^k-20289311 is a prime.

It is a super-2 number, since 2×20289311² = 823312281709442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20289317) 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, 10166 + ... + 11996.

It is an arithmetic number, because the mean of its divisors is an integer number (2901888).

Almost surely, 2^20289311 is an apocalyptic number.

20289311 is a deficient number, since it is larger than the sum of its proper divisors (2925793).

20289311 is a wasteful number, since it uses less digits than its factorization.

20289311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3421.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 20289311 is about 4504.3657711158. The cubic root of 20289311 is about 272.7443522671.

The spelling of 20289311 in words is "twenty million, two hundred eighty-nine thousand, three hundred eleven".