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20251 = 711263
BaseRepresentation
bin100111100011011
31000210001
410330123
51122001
6233431
7113020
oct47433
930701
1020251
1114240
12b877
1392aa
147547
156001
hex4f1b

20251 has 8 divisors (see below), whose sum is σ = 25344. Its totient is φ = 15720.

The previous prime is 20249. The next prime is 20261. The reversal of 20251 is 15202.

20251 = T33 + T34 + ... + T53.

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 20251 - 21 = 20249 is a prime.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (20201) 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, 55 + ... + 208.

It is an arithmetic number, because the mean of its divisors is an integer number (3168).

220251 is an apocalyptic number.

20251 is a deficient number, since it is larger than the sum of its proper divisors (5093).

20251 is a wasteful number, since it uses less digits than its factorization.

20251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281.

The product of its (nonzero) digits is 20, while the sum is 10.

The square root of 20251 is about 142.3060083060. The cubic root of 20251 is about 27.2572575568.

Adding to 20251 its reverse (15202), we get a palindrome (35453).

It can be divided in two parts, 202 and 51, that added together give a triangular number (253 = T22).

The spelling of 20251 in words is "twenty thousand, two hundred fifty-one".

Divisors: 1 7 11 77 263 1841 2893 20251