1220078920 has 64 divisors (see below), whose sum is σ = 2898316800. Its totient is φ = 462241728.

The previous prime is 1220078917. The next prime is 1220078927. The reversal of 1220078920 is 298700221.

It is not an unprimeable number, because it can be changed into a prime (1220078927) 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, 272137 + ... + 276583.

It is an arithmetic number, because the mean of its divisors is an integer number (45286200).

Almost surely, 2^1220078920 is an apocalyptic number.

1220078920 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 1220078920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1449158400).

1220078920 is an abundant number, since it is smaller than the sum of its proper divisors (1678237880).

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

1220078920 is an equidigital number, since it uses as much as digits as its factorization.

1220078920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4515 (or 4473 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 1220078920 is about 34929.6281113899. The cubic root of 1220078920 is about 1068.5527701893.

The spelling of 1220078920 in words is "one billion, two hundred twenty million, seventy-eight thousand, nine hundred twenty".