305220431 has 4 divisors (see below), whose sum is σ = 323174592. Its totient is φ = 287266272.

The previous prime is 305220413. The next prime is 305220439. The reversal of 305220431 is 134022503.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134022503 = 821 ⋅163243.

It is not a de Polignac number, because 305220431 - 2⁶ = 305220367 is a prime.

It is a super-2 number, since 2×305220431² = 186319022999651522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (305220439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8977055 + ... + 8977088.

It is an arithmetic number, because the mean of its divisors is an integer number (80793648).

Almost surely, 2^305220431 is an apocalyptic number.

305220431 is a deficient number, since it is larger than the sum of its proper divisors (17954161).

305220431 is a wasteful number, since it uses less digits than its factorization.

305220431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17954160.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 305220431 is about 17470.5589778919. The cubic root of 305220431 is about 673.2936735836.

Adding to 305220431 its reverse (134022503), we get a palindrome (439242934).

The spelling of 305220431 in words is "three hundred five million, two hundred twenty thousand, four hundred thirty-one".