20070305 has 12 divisors (see below), whose sum is σ = 24564540. Its totient is φ = 15742272.

The previous prime is 20070257. The next prime is 20070307. The reversal of 20070305 is 50307002.

It can be written as a sum of positive squares in 6 ways, for example, as 214369 + 19855936 = 463^2 + 4456^2 .

It is not a de Polignac number, because 20070305 - 2⁸ = 20070049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20070307) 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, 13331 + ... + 14759.

It is an arithmetic number, because the mean of its divisors is an integer number (2047045).

Almost surely, 2^20070305 is an apocalyptic number.

It is an amenable number.

20070305 is a deficient number, since it is larger than the sum of its proper divisors (4494235).

20070305 is an equidigital number, since it uses as much as digits as its factorization.

20070305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1540 (or 1487 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 17.

The square root of 20070305 is about 4479.9893973089. The cubic root of 20070305 is about 271.7594515808.

Adding to 20070305 its reverse (50307002), we get a palindrome (70377307).

The spelling of 20070305 in words is "twenty million, seventy thousand, three hundred five".