20950506 has 24 divisors (see below), whose sum is σ = 45476964. Its totient is φ = 6970560.

The previous prime is 20950469. The next prime is 20950537. The reversal of 20950506 is 60505902.

It can be written as a sum of positive squares in 2 ways, for example, as 20930625 + 19881 = 4575^2 + 141^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20950506.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18550 + ... + 19646.

Almost surely, 2^20950506 is an apocalyptic number.

20950506 is an abundant number, since it is smaller than the sum of its proper divisors (24526458).

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

20950506 is a wasteful number, since it uses less digits than its factorization.

20950506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2166 (or 2163 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 20950506 is about 4577.1722711735. The cubic root of 20950506 is about 275.6755007964.

The spelling of 20950506 in words is "twenty million, nine hundred fifty thousand, five hundred six".