20650506 has 16 divisors (see below), whose sum is σ = 41580000. Its totient is φ = 6837008.

The previous prime is 20650501. The next prime is 20650507. The reversal of 20650506 is 60505602.

It is not an unprimeable number, because it can be changed into a prime (20650501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10656 + ... + 12443.

It is an arithmetic number, because the mean of its divisors is an integer number (2598750).

Almost surely, 2^20650506 is an apocalyptic number.

20650506 is an abundant number, since it is smaller than the sum of its proper divisors (20929494).

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

20650506 is a wasteful number, since it uses less digits than its factorization.

20650506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23253.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 20650506 is about 4544.2827816939. The cubic root of 20650506 is about 274.3533279029.

The spelling of 20650506 in words is "twenty million, six hundred fifty thousand, five hundred six".