20420432 has 20 divisors (see below), whose sum is σ = 39643296. Its totient is φ = 10189920.

The previous prime is 20420377. The next prime is 20420443. The reversal of 20420432 is 23402402.

It is a self number, because there is not a number n which added to its sum of digits gives 20420432.

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, 10133 + ... + 11979.

Almost surely, 2^20420432 is an apocalyptic number.

It is an amenable number.

20420432 is a deficient number, since it is larger than the sum of its proper divisors (19222864).

20420432 is a wasteful number, since it uses less digits than its factorization.

20420432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2546 (or 2540 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 20420432 is about 4518.8972106035. The cubic root of 20420432 is about 273.3306338553.

Adding to 20420432 its reverse (23402402), we get a palindrome (43822834).

The spelling of 20420432 in words is "twenty million, four hundred twenty thousand, four hundred thirty-two".