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20723 = 172353
BaseRepresentation
bin101000011110011
31001102112
411003303
51130343
6235535
7114263
oct50363
931375
1020723
111462a
12bbab
139581
1477a3
156218
hex50f3

20723 has 8 divisors (see below), whose sum is σ = 23328. Its totient is φ = 18304.

The previous prime is 20719. The next prime is 20731. The reversal of 20723 is 32702.

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

It is a cyclic number.

It is not a de Polignac number, because 20723 - 22 = 20719 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20698 and 20707.

It is not an unprimeable number, because it can be changed into a prime (20743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 365 + ... + 417.

It is an arithmetic number, because the mean of its divisors is an integer number (2916).

220723 is an apocalyptic number.

20723 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20723 is a deficient number, since it is larger than the sum of its proper divisors (2605).

20723 is a wasteful number, since it uses less digits than its factorization.

20723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93.

The product of its (nonzero) digits is 84, while the sum is 14.

The square root of 20723 is about 143.9548540342. The cubic root of 20723 is about 27.4673993845.

It can be divided in two parts, 2072 and 3, that multiplied together give a triangular number (6216 = T111).

The spelling of 20723 in words is "twenty thousand, seven hundred twenty-three", and thus it is an iban number.

Divisors: 1 17 23 53 391 901 1219 20723