20355065 has 16 divisors (see below), whose sum is σ = 25837056. Its totient is φ = 15369600.

The previous prime is 20355047. The next prime is 20355067. The reversal of 20355065 is 56055302.

It is not a de Polignac number, because 20355065 - 2¹⁰ = 20354041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20355067) 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, 4754 + ... + 7956.

It is an arithmetic number, because the mean of its divisors is an integer number (1614816).

Almost surely, 2^20355065 is an apocalyptic number.

It is an amenable number.

20355065 is a deficient number, since it is larger than the sum of its proper divisors (5481991).

20355065 is a wasteful number, since it uses less digits than its factorization.

20355065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3280.

The product of its (nonzero) digits is 4500, while the sum is 26.

The square root of 20355065 is about 4511.6587858569. The cubic root of 20355065 is about 273.0386729776.

The spelling of 20355065 in words is "twenty million, three hundred fifty-five thousand, sixty-five".