20432 has 10 divisors (see below), whose sum is σ = 39618.
Its totient is φ = 10208.
The previous prime is 20431. The next prime is 20441. The reversal of 20432 is 23402.
It can be written as a sum of positive squares in only one way, i.e., 18496 + 1936 = 136^2 + 44^2
It is a plaindrome in base 7.
It is a zygodrome in base 7.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (20431) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623 + ... + 654.
220432 is an apocalyptic number.
It is an amenable number.
20432 is a deficient number, since it is larger than the sum of its proper divisors (19186).
20432 is a wasteful number, since it uses less digits than its factorization.
20432 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1285 (or 1279 counting only the distinct ones).
The product of its (nonzero) digits is 48, while the sum is 11.
The square root of 20432 is about 142.9405470816.
The cubic root of 20432 is about 27.3382237267.
Adding to 20432 its reverse (23402), we get a palindrome (43834).
The spelling of 20432 in words is "twenty thousand, four hundred thirty-two".