1220120020 has 24 divisors (see below), whose sum is σ = 2928288384. Its totient is φ = 418326816.

The previous prime is 1220119993. The next prime is 1220120021. The reversal of 1220120020 is 200210221.

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 = 1220119979 and 1220120006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220120021) 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, 4357432 + ... + 4357711.

It is an arithmetic number, because the mean of its divisors is an integer number (122012016).

Almost surely, 2^1220120020 is an apocalyptic number.

1220120020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220120020 is an abundant number, since it is smaller than the sum of its proper divisors (1708168364).

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

1220120020 is a wasteful number, since it uses less digits than its factorization.

1220120020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8715159 (or 8715157 counting only the distinct ones).

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

The square root of 1220120020 is about 34930.2164321952. The cubic root of 1220120020 is about 1068.5647686005.

Adding to 1220120020 its reverse (200210221), we get a palindrome (1420330241).

The spelling of 1220120020 in words is "one billion, two hundred twenty million, one hundred twenty thousand, twenty".