1220508720 has 120 divisors (see below), whose sum is σ = 4105454496. Its totient is φ = 324946944.

The previous prime is 1220508691. The next prime is 1220508721. The reversal of 1220508720 is 278050221.

It is a tau number, because it is divible by the number of its divisors (120).

It is not an unprimeable number, because it can be changed into a prime (1220508721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 695364 + ... + 697116.

Almost surely, 2^1220508720 is an apocalyptic number.

1220508720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220508720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2052727248).

1220508720 is an abundant number, since it is smaller than the sum of its proper divisors (2884945776).

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

1220508720 is a wasteful number, since it uses less digits than its factorization.

1220508720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2739 (or 2730 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 1220508720 is about 34935.7799397695. The cubic root of 1220508720 is about 1068.6782293037.

Adding to 1220508720 its reverse (278050221), we get a palindrome (1498558941).

The spelling of 1220508720 in words is "one billion, two hundred twenty million, five hundred eight thousand, seven hundred twenty".