20500365 has 16 divisors (see below), whose sum is σ = 32856768. Its totient is φ = 10914816.

The previous prime is 20500357. The next prime is 20500367. The reversal of 20500365 is 56300502.

It is not a de Polignac number, because 20500365 - 2³ = 20500357 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20500367) 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, 16237 + ... + 17453.

It is an arithmetic number, because the mean of its divisors is an integer number (2053548).

Almost surely, 2^20500365 is an apocalyptic number.

It is an amenable number.

20500365 is a deficient number, since it is larger than the sum of its proper divisors (12356403).

20500365 is a wasteful number, since it uses less digits than its factorization.

20500365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2348.

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 20500365 is about 4527.7328763963. The cubic root of 20500365 is about 273.6868080407.

Adding to 20500365 its reverse (56300502), we get a palindrome (76800867).

The spelling of 20500365 in words is "twenty million, five hundred thousand, three hundred sixty-five".