20650605 has 16 divisors (see below), whose sum is σ = 33495360. Its totient is φ = 10862208.

The previous prime is 20650603. The next prime is 20650607. The reversal of 20650605 is 50605602.

It is an interprime number because it is at equal distance from previous prime (20650603) and next prime (20650607).

It is not a de Polignac number, because 20650605 - 2¹ = 20650603 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20650601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8335 + ... + 10524.

It is an arithmetic number, because the mean of its divisors is an integer number (2093460).

Almost surely, 2^20650605 is an apocalyptic number.

It is an amenable number.

20650605 is a deficient number, since it is larger than the sum of its proper divisors (12844755).

20650605 is a wasteful number, since it uses less digits than its factorization.

20650605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18940.

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

The square root of 20650605 is about 4544.2936744889. The cubic root of 20650605 is about 274.3537663253.

The spelling of 20650605 in words is "twenty million, six hundred fifty thousand, six hundred five".