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20963 is a prime number
BaseRepresentation
bin101000111100011
31001202102
411013203
51132323
6241015
7115055
oct50743
931672
1020963
1114828
121016b
139707
1478d5
156328
hex51e3

20963 has 2 divisors, whose sum is σ = 20964. Its totient is φ = 20962.

The previous prime is 20959. The next prime is 20981. The reversal of 20963 is 36902.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20963 - 22 = 20959 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (20903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10481 + 10482.

It is an arithmetic number, because the mean of its divisors is an integer number (10482).

220963 is an apocalyptic number.

20963 is a deficient number, since it is larger than the sum of its proper divisors (1).

20963 is an equidigital number, since it uses as much as digits as its factorization.

20963 is an evil number, because the sum of its binary digits is even.

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

The square root of 20963 is about 144.7860490517. The cubic root of 20963 is about 27.5730290328.

It can be divided in two parts, 209 and 63, that added together give a palindrome (272).

The spelling of 20963 in words is "twenty thousand, nine hundred sixty-three".