18220413 has 8 divisors (see below), whose sum is σ = 25723008. Its totient is φ = 11432384.

The previous prime is 18220403. The next prime is 18220417. The reversal of 18220413 is 31402281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18220413 - 2¹⁴ = 18204029 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18220413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18220417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178581 + ... + 178682.

It is an arithmetic number, because the mean of its divisors is an integer number (3215376).

Almost surely, 2^18220413 is an apocalyptic number.

It is an amenable number.

18220413 is a deficient number, since it is larger than the sum of its proper divisors (7502595).

18220413 is a wasteful number, since it uses less digits than its factorization.

18220413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357283.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 18220413 is about 4268.5375715812. The cubic root of 18220413 is about 263.1395164478.

Adding to 18220413 its reverse (31402281), we get a palindrome (49622694).

The spelling of 18220413 in words is "eighteen million, two hundred twenty thousand, four hundred thirteen".