20730075 has 12 divisors (see below), whose sum is σ = 34273848. Its totient is φ = 11056000.

The previous prime is 20730067. The next prime is 20730079. The reversal of 20730075 is 57003702.

It is not a de Polignac number, because 20730075 - 2³ = 20730067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20730079) 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, 138126 + ... + 138275.

It is an arithmetic number, because the mean of its divisors is an integer number (2856154).

Almost surely, 2^20730075 is an apocalyptic number.

20730075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20730075 is a deficient number, since it is larger than the sum of its proper divisors (13543773).

20730075 is a wasteful number, since it uses less digits than its factorization.

20730075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276414 (or 276409 counting only the distinct ones).

The product of its (nonzero) digits is 1470, while the sum is 24.

The square root of 20730075 is about 4553.0292114152. The cubic root of 20730075 is about 274.7052489305.

Adding to 20730075 its reverse (57003702), we get a palindrome (77733777).

The spelling of 20730075 in words is "twenty million, seven hundred thirty thousand, seventy-five".