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20731066 = 259175687
BaseRepresentation
bin100111100010…
…1010010111010
31110000020200021
41033011102322
520301343231
62020201054
7341132266
oct117052272
943006607
1020731066
111077a614
126b3918a
1343ab105
142a790a6
151c47811
hex13c54ba

20731066 has 8 divisors (see below), whose sum is σ = 31623840. Its totient is φ = 10189788.

The previous prime is 20731057. The next prime is 20731069. The reversal of 20731066 is 66013702.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20731066.

It is not an unprimeable number, because it can be changed into a prime (20731069) by changing a digit.

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, 87726 + ... + 87961.

It is an arithmetic number, because the mean of its divisors is an integer number (3952980).

Almost surely, 220731066 is an apocalyptic number.

20731066 is a deficient number, since it is larger than the sum of its proper divisors (10892774).

20731066 is a wasteful number, since it uses less digits than its factorization.

20731066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175748.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 20731066 is about 4553.1380387596. The cubic root of 20731066 is about 274.7096262834.

Adding to 20731066 its reverse (66013702), we get a palindrome (86744768).

The spelling of 20731066 in words is "twenty million, seven hundred thirty-one thousand, sixty-six".

Divisors: 1 2 59 118 175687 351374 10365533 20731066