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20936 = 232617
BaseRepresentation
bin101000111001000
31001201102
411013020
51132221
6240532
7115016
oct50710
931642
1020936
1114803
1210148
1396b6
1478b6
15630b
hex51c8

20936 has 8 divisors (see below), whose sum is σ = 39270. Its totient is φ = 10464.

The previous prime is 20929. The next prime is 20939. The reversal of 20936 is 63902.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12100 + 8836 = 110^2 + 94^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (20939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1301 + ... + 1316.

220936 is an apocalyptic number.

It is an amenable number.

20936 is a deficient number, since it is larger than the sum of its proper divisors (18334).

20936 is a wasteful number, since it uses less digits than its factorization.

20936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2623 (or 2619 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 20936 is about 144.6927779815. The cubic root of 20936 is about 27.5611860772.

The spelling of 20936 in words is "twenty thousand, nine hundred thirty-six".

Divisors: 1 2 4 8 2617 5234 10468 20936