1220020120 has 64 divisors (see below), whose sum is σ = 3006525600. Its totient is φ = 441876480.

The previous prime is 1220020093. The next prime is 1220020121. The reversal of 1220020120 is 210200221.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 1220020097 and 1220020106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220020121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107686 + ... + 118474.

Almost surely, 2^1220020120 is an apocalyptic number.

1220020120 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 1220020120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1503262800).

1220020120 is an abundant number, since it is smaller than the sum of its proper divisors (1786505480).

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

1220020120 is a wasteful number, since it uses less digits than its factorization.

1220020120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11068 (or 11064 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 1220020120 is about 34928.7864089207. The cubic root of 1220020120 is about 1068.5356041106.

Adding to 1220020120 its reverse (210200221), we get a palindrome (1430220341).

It can be divided in two parts, 12200201 and 20, that added together give a palindrome (12200221).

The spelling of 1220020120 in words is "one billion, two hundred twenty million, twenty thousand, one hundred twenty".