20006865 has 16 divisors (see below), whose sum is σ = 35568000. Its totient is φ = 10670256.

The previous prime is 20006851. The next prime is 20006869. The reversal of 20006865 is 56860002.

It is not a de Polignac number, because 20006865 - 2⁶ = 20006801 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 not an unprimeable number, because it can be changed into a prime (20006869) 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, 73965 + ... + 74234.

It is an arithmetic number, because the mean of its divisors is an integer number (2223000).

Almost surely, 2^20006865 is an apocalyptic number.

It is an amenable number.

20006865 is a deficient number, since it is larger than the sum of its proper divisors (15561135).

20006865 is a wasteful number, since it uses less digits than its factorization.

20006865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148213 (or 148207 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 20006865 is about 4472.9034194805. The cubic root of 20006865 is about 271.4728155682.

Adding to 20006865 its reverse (56860002), we get a palindrome (76866867).

The spelling of 20006865 in words is "twenty million, six thousand, eight hundred sixty-five".