20403232 has 12 divisors (see below), whose sum is σ = 40168926. Its totient is φ = 10201600.

The previous prime is 20403223. The next prime is 20403233. The reversal of 20403232 is 23230402.

It can be written as a sum of positive squares in only one way, i.e., 19395216 + 1008016 = 4404^2 + 1004^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (20403233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318769 + ... + 318832.

Almost surely, 2^20403232 is an apocalyptic number.

It is an amenable number.

20403232 is a deficient number, since it is larger than the sum of its proper divisors (19765694).

20403232 is an equidigital number, since it uses as much as digits as its factorization.

20403232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637611 (or 637603 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 16.

The square root of 20403232 is about 4516.9936904981. The cubic root of 20403232 is about 273.2538707474.

Adding to 20403232 its reverse (23230402), we get a palindrome (43633634).

The spelling of 20403232 in words is "twenty million, four hundred three thousand, two hundred thirty-two".