20730632 has 32 divisors (see below), whose sum is σ = 42661080. Its totient is φ = 9384960.

The previous prime is 20730623. The next prime is 20730719. The reversal of 20730632 is 23603702.

It can be written as a sum of positive squares in 4 ways, for example, as 15952036 + 4778596 = 3994^2 + 2186^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20730598 and 20730607.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3632 + ... + 7392.

Almost surely, 2^20730632 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20730632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21330540).

20730632 is an abundant number, since it is smaller than the sum of its proper divisors (21930448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20730632 is a wasteful number, since it uses less digits than its factorization.

20730632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3833 (or 3829 counting only the distinct ones).

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

The square root of 20730632 is about 4553.0903790722. The cubic root of 20730632 is about 274.7077092762.

The spelling of 20730632 in words is "twenty million, seven hundred thirty thousand, six hundred thirty-two".