228020013 has 48 divisors (see below), whose sum is σ = 369393024. Its totient is φ = 134628480.

The previous prime is 228020003. The next prime is 228020021. The reversal of 228020013 is 310020822.

It is a happy number.

It is not a de Polignac number, because 228020013 - 2⁹ = 228019501 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228020003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 306520 + ... + 307262.

It is an arithmetic number, because the mean of its divisors is an integer number (7695688).

Almost surely, 2^228020013 is an apocalyptic number.

It is an amenable number.

228020013 is a deficient number, since it is larger than the sum of its proper divisors (141373011).

228020013 is a wasteful number, since it uses less digits than its factorization.

228020013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866 (or 863 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 228020013 is about 15100.3315526514. The cubic root of 228020013 is about 610.9293484255.

Adding to 228020013 its reverse (310020822), we get a palindrome (538040835).

The spelling of 228020013 in words is "two hundred twenty-eight million, twenty thousand, thirteen".