20707506 has 12 divisors (see below), whose sum is σ = 44866302. Its totient is φ = 6902496.

The previous prime is 20707483. The next prime is 20707507. The reversal of 20707506 is 60570702.

It can be written as a sum of positive squares in only one way, i.e., 18844281 + 1863225 = 4341^2 + 1365^2 .

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20707506.

It is not an unprimeable number, because it can be changed into a prime (20707507) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 575191 + ... + 575226.

Almost surely, 2^20707506 is an apocalyptic number.

20707506 is an abundant number, since it is smaller than the sum of its proper divisors (24158796).

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

20707506 is a wasteful number, since it uses less digits than its factorization.

20707506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1150425 (or 1150422 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 20707506 is about 4550.5500766391. The cubic root of 20707506 is about 274.6055214563.

The spelling of 20707506 in words is "twenty million, seven hundred seven thousand, five hundred six".