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20429 = 31659
BaseRepresentation
bin100111111001101
31001000122
410333031
51123204
6234325
7113363
oct47715
931018
1020429
1114392
12b9a5
1393b6
147633
1560be
hex4fcd

20429 has 4 divisors (see below), whose sum is σ = 21120. Its totient is φ = 19740.

The previous prime is 20411. The next prime is 20431. The reversal of 20429 is 92402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20429 - 28 = 20173 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20479) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 299 + ... + 360.

It is an arithmetic number, because the mean of its divisors is an integer number (5280).

220429 is an apocalyptic number.

It is an amenable number.

20429 is a deficient number, since it is larger than the sum of its proper divisors (691).

20429 is an equidigital number, since it uses as much as digits as its factorization.

20429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 20429 is about 142.9300528231. The cubic root of 20429 is about 27.3368856511.

The spelling of 20429 in words is "twenty thousand, four hundred twenty-nine".

Divisors: 1 31 659 20429