20308075 has 12 divisors (see below), whose sum is σ = 25319808. Its totient is φ = 16157600.

The previous prime is 20308073. The next prime is 20308097. The reversal of 20308075 is 57080302.

It is not a de Polignac number, because 20308075 - 2¹ = 20308073 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20308073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2649 + ... + 6901.

It is an arithmetic number, because the mean of its divisors is an integer number (2109984).

Almost surely, 2^20308075 is an apocalyptic number.

20308075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20308075 is a deficient number, since it is larger than the sum of its proper divisors (5011733).

20308075 is a wasteful number, since it uses less digits than its factorization.

20308075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4454 (or 4449 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 20308075 is about 4506.4481579177. The cubic root of 20308075 is about 272.8284063479.

Adding to 20308075 its reverse (57080302), we get a palindrome (77388377).

The spelling of 20308075 in words is "twenty million, three hundred eight thousand, seventy-five".