20421232 has 20 divisors (see below), whose sum is σ = 42610120. Its totient is φ = 9425088.

The previous prime is 20421229. The next prime is 20421241. The reversal of 20421232 is 23212402.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48882 + ... + 49297.

It is an arithmetic number, because the mean of its divisors is an integer number (2130506).

Almost surely, 2^20421232 is an apocalyptic number.

It is an amenable number.

20421232 is an abundant number, since it is smaller than the sum of its proper divisors (22188888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20421232 is a wasteful number, since it uses less digits than its factorization.

20421232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98200 (or 98194 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 20421232 is about 4518.9857269082. The cubic root of 20421232 is about 273.3342031832.

Adding to 20421232 its reverse (23212402), we get a palindrome (43633634).

The spelling of 20421232 in words is "twenty million, four hundred twenty-one thousand, two hundred thirty-two".