20307632 has 20 divisors (see below), whose sum is σ = 39992976. Its totient is φ = 9986880.

The previous prime is 20307631. The next prime is 20307641. The reversal of 20307632 is 23670302.

It is a junction number, because it is equal to n+sod(n) for n = 20307598 and 20307607.

It is not an unprimeable number, because it can be changed into a prime (20307631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9428 + ... + 11379.

Almost surely, 2^20307632 is an apocalyptic number.

It is an amenable number.

20307632 is a deficient number, since it is larger than the sum of its proper divisors (19685344).

20307632 is a wasteful number, since it uses less digits than its factorization.

20307632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20876 (or 20870 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 23.

The square root of 20307632 is about 4506.3990058582. The cubic root of 20307632 is about 272.8264225087.

Adding to 20307632 its reverse (23670302), we get a palindrome (43977934).

The spelling of 20307632 in words is "twenty million, three hundred seven thousand, six hundred thirty-two".