1305432220 has 24 divisors (see below), whose sum is σ = 2742907104. Its totient is φ = 521887296.

The previous prime is 1305432181. The next prime is 1305432253. The reversal of 1305432220 is 222345031.

It is a junction number, because it is equal to n+sod(n) for n = 1305432191 and 1305432200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21777 + ... + 55543.

It is an arithmetic number, because the mean of its divisors is an integer number (114287796).

Almost surely, 2^1305432220 is an apocalyptic number.

1305432220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1305432220 is an abundant number, since it is smaller than the sum of its proper divisors (1437474884).

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

1305432220 is a wasteful number, since it uses less digits than its factorization.

1305432220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35709 (or 35707 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 1305432220 is about 36130.7655606687. The cubic root of 1305432220 is about 1092.9109465058.

Adding to 1305432220 its reverse (222345031), we get a palindrome (1527777251).

The spelling of 1305432220 in words is "one billion, three hundred five million, four hundred thirty-two thousand, two hundred twenty".