1220320420 has 24 divisors (see below), whose sum is σ = 2795643648. Its totient is φ = 443752800.

The previous prime is 1220320411. The next prime is 1220320427. The reversal of 1220320420 is 240230221.

It is a junction number, because it is equal to n+sod(n) for n = 1220320394 and 1220320403.

It is not an unprimeable number, because it can be changed into a prime (1220320427) 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, 2773236 + ... + 2773675.

It is an arithmetic number, because the mean of its divisors is an integer number (116485152).

Almost surely, 2^1220320420 is an apocalyptic number.

1220320420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220320420 is an abundant number, since it is smaller than the sum of its proper divisors (1575323228).

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

1220320420 is a wasteful number, since it uses less digits than its factorization.

1220320420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5546931 (or 5546929 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 1220320420 is about 34933.0848909741. The cubic root of 1220320420 is about 1068.6232679430.

Adding to 1220320420 its reverse (240230221), we get a palindrome (1460550641).

It can be divided in two parts, 12203 and 20420, that added together give a palindrome (32623).

The spelling of 1220320420 in words is "one billion, two hundred twenty million, three hundred twenty thousand, four hundred twenty".