305440220 has 24 divisors (see below), whose sum is σ = 642517008. Its totient is φ = 121968000.

The previous prime is 305440199. The next prime is 305440229. The reversal of 305440220 is 22044503.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 305440192 and 305440201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (305440229) 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, 686 + ... + 24725.

It is an arithmetic number, because the mean of its divisors is an integer number (26771542).

Almost surely, 2^305440220 is an apocalyptic number.

It is an amenable number.

305440220 is an abundant number, since it is smaller than the sum of its proper divisors (337076788).

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

305440220 is a wasteful number, since it uses less digits than its factorization.

305440220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26021 (or 26019 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 305440220 is about 17476.8481140050. The cubic root of 305440220 is about 673.4552475607.

Adding to 305440220 its reverse (22044503), we get a palindrome (327484723).

The spelling of 305440220 in words is "three hundred five million, four hundred forty thousand, two hundred twenty".