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20854 = 210427
BaseRepresentation
bin101000101110110
31001121101
411011312
51131404
6240314
7114541
oct50566
931541
1020854
1114739
121009a
139652
147858
1562a4
hex5176

20854 has 4 divisors (see below), whose sum is σ = 31284. Its totient is φ = 10426.

The previous prime is 20849. The next prime is 20857. The reversal of 20854 is 45802.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45802 = 222901.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5212 + ... + 5215.

It is an arithmetic number, because the mean of its divisors is an integer number (7821).

220854 is an apocalyptic number.

20854 is a deficient number, since it is larger than the sum of its proper divisors (10430).

20854 is a wasteful number, since it uses less digits than its factorization.

20854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10429.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 20854 is about 144.4091409849. The cubic root of 20854 is about 27.5251560445.

It can be divided in two parts, 208 and 54, that added together give a palindrome (262).

The spelling of 20854 in words is "twenty thousand, eight hundred fifty-four".

Divisors: 1 2 10427 20854