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20448686 = 264315901
BaseRepresentation
bin100111000000…
…0010110101110
31102110220022202
41032000112232
520213324221
62010141502
7335545106
oct116002656
942426282
1020448686
11105a7445
126a21892
13430c71b
142a04206
151bddd0b
hex13805ae

20448686 has 8 divisors (see below), whose sum is σ = 30722664. Its totient is φ = 10207800.

The previous prime is 20448661. The next prime is 20448689. The reversal of 20448686 is 68684402.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20448689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6665 + ... + 9236.

It is an arithmetic number, because the mean of its divisors is an integer number (3840333).

Almost surely, 220448686 is an apocalyptic number.

20448686 is a deficient number, since it is larger than the sum of its proper divisors (10273978).

20448686 is a wasteful number, since it uses less digits than its factorization.

20448686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16546.

The product of its (nonzero) digits is 73728, while the sum is 38.

The square root of 20448686 is about 4522.0223351947. The cubic root of 20448686 is about 273.4566371433.

The spelling of 20448686 in words is "twenty million, four hundred forty-eight thousand, six hundred eighty-six".

Divisors: 1 2 643 1286 15901 31802 10224343 20448686