20650385 has 16 divisors (see below), whose sum is σ = 28498176. Its totient is φ = 14071488.

The previous prime is 20650381. The next prime is 20650387. The reversal of 20650385 is 58305602.

It is a cyclic number.

It is not a de Polignac number, because 20650385 - 2² = 20650381 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20650381) 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, 4079 + ... + 7611.

It is an arithmetic number, because the mean of its divisors is an integer number (1781136).

Almost surely, 2^20650385 is an apocalyptic number.

It is an amenable number.

20650385 is a deficient number, since it is larger than the sum of its proper divisors (7847791).

20650385 is a wasteful number, since it uses less digits than its factorization.

20650385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3712.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 20650385 is about 4544.2694682424. The cubic root of 20650385 is about 274.3527920513.

Adding to 20650385 its reverse (58305602), we get a palindrome (78955987).

The spelling of 20650385 in words is "twenty million, six hundred fifty thousand, three hundred eighty-five".