220304431 has 4 divisors (see below), whose sum is σ = 220859752. Its totient is φ = 219749112.

The previous prime is 220304417. The next prime is 220304473. The reversal of 220304431 is 134403022.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 220304431 - 2¹⁵ = 220271663 is a prime.

It is a super-2 number, since 2×220304431² = 97068084636467522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220304399 and 220304408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220304131) 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 3 ways as a sum of consecutive naturals, for example, 277065 + ... + 277858.

It is an arithmetic number, because the mean of its divisors is an integer number (55214938).

Almost surely, 2^220304431 is an apocalyptic number.

220304431 is a deficient number, since it is larger than the sum of its proper divisors (555321).

220304431 is an equidigital number, since it uses as much as digits as its factorization.

220304431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555320.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 220304431 is about 14842.6557933545. The cubic root of 220304431 is about 603.9593987225.

Adding to 220304431 its reverse (134403022), we get a palindrome (354707453).

The spelling of 220304431 in words is "two hundred twenty million, three hundred four thousand, four hundred thirty-one".