1220020311220 has 96 divisors (see below), whose sum is σ = 2733847200000. Its totient is φ = 455736489984.

The previous prime is 1220020311197. The next prime is 1220020311229. The reversal of 1220020311220 is 221130200221.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1220020311194 and 1220020311203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220020311229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49786531 + ... + 49811029.

It is an arithmetic number, because the mean of its divisors is an integer number (28477575000).

Almost surely, 2^{1220020311220} is an apocalyptic number.

1220020311220 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 1220020311220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1366923600000).

1220020311220 is an abundant number, since it is smaller than the sum of its proper divisors (1513826888780).

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

1220020311220 is a wasteful number, since it uses less digits than its factorization.

1220020311220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25657 (or 25655 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 1220020311220 its reverse (221130200221), we get a palindrome (1441150511441).

The spelling of 1220020311220 in words is "one trillion, two hundred twenty billion, twenty million, three hundred eleven thousand, two hundred twenty".