20639732 has 12 divisors (see below), whose sum is σ = 36158976. Its totient is φ = 10308600.

The previous prime is 20639701. The next prime is 20639741. The reversal of 20639732 is 23793602.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2363 + ... + 6845.

It is an arithmetic number, because the mean of its divisors is an integer number (3013248).

Almost surely, 2^20639732 is an apocalyptic number.

It is an amenable number.

20639732 is a deficient number, since it is larger than the sum of its proper divisors (15519244).

20639732 is a wasteful number, since it uses less digits than its factorization.

20639732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5638 (or 5636 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 32.

The square root of 20639732 is about 4543.0971814391. The cubic root of 20639732 is about 274.3056067645.

The spelling of 20639732 in words is "twenty million, six hundred thirty-nine thousand, seven hundred thirty-two".