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20679 = 361113
BaseRepresentation
bin101000011000111
31001100220
411003013
51130204
6235423
7114201
oct50307
931326
1020679
111459a
12bb73
139549
147771
1561d9
hex50c7

20679 has 8 divisors (see below), whose sum is σ = 28272. Its totient is φ = 13440.

The previous prime is 20663. The next prime is 20681. The reversal of 20679 is 97602.

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

It is not a de Polignac number, because 20679 - 24 = 20663 is a prime.

20679 is a lucky number.

It is a plaindrome in base 11.

It is a nialpdrome in base 12 and base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127 + ... + 239.

It is an arithmetic number, because the mean of its divisors is an integer number (3534).

220679 is an apocalyptic number.

20679 is a deficient number, since it is larger than the sum of its proper divisors (7593).

20679 is a wasteful number, since it uses less digits than its factorization.

20679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177.

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 20679 is about 143.8019471356. The cubic root of 20679 is about 27.4479456062.

The spelling of 20679 in words is "twenty thousand, six hundred seventy-nine".

Divisors: 1 3 61 113 183 339 6893 20679