20617065 has 32 divisors (see below), whose sum is σ = 41890560. Its totient is φ = 9424512.

The previous prime is 20617049. The next prime is 20617127. The reversal of 20617065 is 56071602.

It is not a de Polignac number, because 20617065 - 2⁴ = 20617049 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9964 + ... + 11853.

It is an arithmetic number, because the mean of its divisors is an integer number (1309080).

Almost surely, 2^20617065 is an apocalyptic number.

It is an amenable number.

20617065 is an abundant number, since it is smaller than the sum of its proper divisors (21273495).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20617065 is a wasteful number, since it uses less digits than its factorization.

20617065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21838 (or 21832 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 20617065 is about 4540.6018323566. The cubic root of 20617065 is about 274.2051538660.

Adding to 20617065 its reverse (56071602), we get a palindrome (76688667).

It can be divided in two parts, 206 and 17065, that added together give a palindrome (17271).

The spelling of 20617065 in words is "twenty million, six hundred seventeen thousand, sixty-five".