20705269 has 16 divisors (see below), whose sum is σ = 24857280. Its totient is φ = 17038080.

The previous prime is 20705261. The next prime is 20705273. The reversal of 20705269 is 96250702.

20705269 = 612² + 613² + ... + 662².

It is not a de Polignac number, because 20705269 - 2³ = 20705261 is a prime.

It is a super-2 number, since 2×20705269² = 857416328724722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20705269.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20705261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1734 + ... + 6664.

It is an arithmetic number, because the mean of its divisors is an integer number (1553580).

Almost surely, 2^20705269 is an apocalyptic number.

It is an amenable number.

20705269 is a deficient number, since it is larger than the sum of its proper divisors (4152011).

20705269 is a wasteful number, since it uses less digits than its factorization.

20705269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4980.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 20705269 is about 4550.3042755403. The cubic root of 20705269 is about 274.5956326963.

The spelling of 20705269 in words is "twenty million, seven hundred five thousand, two hundred sixty-nine".