Search a number
-
+
20726638 = 217609607
BaseRepresentation
bin100111100010…
…0001101101110
31110000000121021
41033010031232
520301223023
62020124354
7341113342
oct117041556
943000537
1020726638
1110777259
126b366ba
1343a90aa
142a77622
151c4635d
hex13c436e

20726638 has 8 divisors (see below), whose sum is σ = 32918832. Its totient is φ = 9753696.

The previous prime is 20726627. The next prime is 20726647. The reversal of 20726638 is 83662702.

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

It is a Harshad number since it is a multiple of its sum of digits (34), and also a Moran number because the ratio is a prime number: 609607 = 20726638 / (2 + 0 + 7 + 2 + 6 + 6 + 3 + 8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 304770 + ... + 304837.

It is an arithmetic number, because the mean of its divisors is an integer number (4114854).

Almost surely, 220726638 is an apocalyptic number.

20726638 is a deficient number, since it is larger than the sum of its proper divisors (12192194).

20726638 is a wasteful number, since it uses less digits than its factorization.

20726638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609626.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 20726638 is about 4552.6517547469. The cubic root of 20726638 is about 274.6900662530.

The spelling of 20726638 in words is "twenty million, seven hundred twenty-six thousand, six hundred thirty-eight".

Divisors: 1 2 17 34 609607 1219214 10363319 20726638