20513432 has 32 divisors (see below), whose sum is σ = 39787200. Its totient is φ = 9909504.

The previous prime is 20513431. The next prime is 20513443. The reversal of 20513432 is 23431502.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20513431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33158 + ... + 33770.

It is an arithmetic number, because the mean of its divisors is an integer number (1243350).

Almost surely, 2^20513432 is an apocalyptic number.

It is an amenable number.

20513432 is a deficient number, since it is larger than the sum of its proper divisors (19273768).

20513432 is a wasteful number, since it uses less digits than its factorization.

20513432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755 (or 751 counting only the distinct ones).

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

The square root of 20513432 is about 4529.1756424321. The cubic root of 20513432 is about 273.7449453137.

Adding to 20513432 its reverse (23431502), we get a palindrome (43944934).

The spelling of 20513432 in words is "twenty million, five hundred thirteen thousand, four hundred thirty-two".