20350665 has 24 divisors (see below), whose sum is σ = 35542728. Its totient is φ = 10771200.

The previous prime is 20350643. The next prime is 20350669. The reversal of 20350665 is 56605302.

It can be written as a sum of positive squares in 4 ways, for example, as 876096 + 19474569 = 936^2 + 4413^2 .

It is not a de Polignac number, because 20350665 - 2⁷ = 20350537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20350669) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4515 + ... + 7815.

It is an arithmetic number, because the mean of its divisors is an integer number (1480947).

Almost surely, 2^20350665 is an apocalyptic number.

It is an amenable number.

20350665 is a deficient number, since it is larger than the sum of its proper divisors (15192063).

20350665 is a wasteful number, since it uses less digits than its factorization.

20350665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3449 (or 3446 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

The square root of 20350665 is about 4511.1711339740. The cubic root of 20350665 is about 273.0189979936.

Adding to 20350665 its reverse (56605302), we get a palindrome (76955967).

The spelling of 20350665 in words is "twenty million, three hundred fifty thousand, six hundred sixty-five".