20806732 has 6 divisors (see below), whose sum is σ = 36411788. Its totient is φ = 10403364.

The previous prime is 20806727. The next prime is 20806733. The reversal of 20806732 is 23760802.

It is a self number, because there is not a number n which added to its sum of digits gives 20806732.

It is not an unprimeable number, because it can be changed into a prime (20806733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2600838 + ... + 2600845.

Almost surely, 2^20806732 is an apocalyptic number.

It is an amenable number.

20806732 is a deficient number, since it is larger than the sum of its proper divisors (15605056).

20806732 is a wasteful number, since it uses less digits than its factorization.

20806732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5201687 (or 5201685 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 20806732 is about 4561.4396850117. The cubic root of 20806732 is about 275.0434399697.

The spelling of 20806732 in words is "twenty million, eight hundred six thousand, seven hundred thirty-two".