20286730 has 16 divisors (see below), whose sum is σ = 37503720. Its totient is φ = 7895232.

The previous prime is 20286719. The next prime is 20286769. The reversal of 20286730 is 3768202.

It can be written as a sum of positive squares in 4 ways, for example, as 17114769 + 3171961 = 4137^2 + 1781^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27045 + ... + 27784.

Almost surely, 2^20286730 is an apocalyptic number.

20286730 is a deficient number, since it is larger than the sum of its proper divisors (17216990).

20286730 is a wasteful number, since it uses less digits than its factorization.

20286730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54873.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 20286730 is about 4504.0792621800. The cubic root of 20286730 is about 272.7327865215.

The spelling of 20286730 in words is "twenty million, two hundred eighty-six thousand, seven hundred thirty".