20736630 has 48 divisors (see below), whose sum is σ = 54419040. Its totient is φ = 5478144.

The previous prime is 20736623. The next prime is 20736647. The reversal of 20736630 is 3663702.

20736630 is a `hidden beast` number, since 20 + 7 + 3 + 6 + 630 = 666.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20736594 and 20736603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9151 + ... + 11189.

It is an arithmetic number, because the mean of its divisors is an integer number (1133730).

Almost surely, 2^20736630 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20736630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27209520).

20736630 is an abundant number, since it is smaller than the sum of its proper divisors (33682410).

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

20736630 is a wasteful number, since it uses less digits than its factorization.

20736630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2165 (or 2162 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 27.

The square root of 20736630 is about 4553.7490049409. The cubic root of 20736630 is about 274.7342004762.

The spelling of 20736630 in words is "twenty million, seven hundred thirty-six thousand, six hundred thirty".