20135432 has 8 divisors (see below), whose sum is σ = 37753950. Its totient is φ = 10067712.

The previous prime is 20135431. The next prime is 20135447. The reversal of 20135432 is 23453102.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20124196 + 11236 = 4486^2 + 106^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (20135431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1258457 + ... + 1258472.

Almost surely, 2^20135432 is an apocalyptic number.

It is an amenable number.

20135432 is a deficient number, since it is larger than the sum of its proper divisors (17618518).

20135432 is a wasteful number, since it uses less digits than its factorization.

20135432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2516935 (or 2516931 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 20135432 is about 4487.2521658583. The cubic root of 20135432 is about 272.0530822006.

Adding to 20135432 its reverse (23453102), we get a palindrome (43588534).

The spelling of 20135432 in words is "twenty million, one hundred thirty-five thousand, four hundred thirty-two".