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20696647 = 80925583
BaseRepresentation
bin100111011110…
…0111001000111
31102221111110111
41032330321013
520244243042
62015333451
7340630036
oct116747107
942844414
1020696647
1110756774
126b21287
13439854a
142a6a71d
151c3c517
hex13bce47

20696647 has 4 divisors (see below), whose sum is σ = 20723040. Its totient is φ = 20670256.

The previous prime is 20696587. The next prime is 20696699. The reversal of 20696647 is 74669602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20696647 - 219 = 20172359 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20696147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11983 + ... + 13600.

It is an arithmetic number, because the mean of its divisors is an integer number (5180760).

Almost surely, 220696647 is an apocalyptic number.

20696647 is a deficient number, since it is larger than the sum of its proper divisors (26393).

20696647 is an equidigital number, since it uses as much as digits as its factorization.

20696647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26392.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 20696647 is about 4549.3567677200. The cubic root of 20696647 is about 274.5575120895.

The spelling of 20696647 in words is "twenty million, six hundred ninety-six thousand, six hundred forty-seven".

Divisors: 1 809 25583 20696647