304531020 has 36 divisors (see below), whose sum is σ = 923744640. Its totient is φ = 81208224.

The previous prime is 304531009. The next prime is 304531027. The reversal of 304531020 is 20135403.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 304530984 and 304531002.

It is not an unprimeable number, because it can be changed into a prime (304531027) 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, 845740 + ... + 846099.

Almost surely, 2^304531020 is an apocalyptic number.

304531020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

304531020 is an abundant number, since it is smaller than the sum of its proper divisors (619213620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

304531020 is a wasteful number, since it uses less digits than its factorization.

304531020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1691854 (or 1691849 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 304531020 is about 17450.8171728432. The cubic root of 304531020 is about 672.7863615561.

Adding to 304531020 its reverse (20135403), we get a palindrome (324666423).

The spelling of 304531020 in words is "three hundred four million, five hundred thirty-one thousand, twenty".