20130286 has 24 divisors (see below), whose sum is σ = 33439392. Its totient is φ = 9081600.

The previous prime is 20130281. The next prime is 20130289. The reversal of 20130286 is 68203102.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20130281) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46491 + ... + 46921.

It is an arithmetic number, because the mean of its divisors is an integer number (1393308).

Almost surely, 2^20130286 is an apocalyptic number.

20130286 is a deficient number, since it is larger than the sum of its proper divisors (13309106).

20130286 is a wasteful number, since it uses less digits than its factorization.

20130286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648 (or 637 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 20130286 is about 4486.6787270764. The cubic root of 20130286 is about 272.0299040795.

Adding to 20130286 its reverse (68203102), we get a palindrome (88333388).

The spelling of 20130286 in words is "twenty million, one hundred thirty thousand, two hundred eighty-six".