1220820960 has 96 divisors (see below), whose sum is σ = 3852969120. Its totient is φ = 324927488.

The previous prime is 1220820959. The next prime is 1220820967. The reversal of 1220820960 is 690280221.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220820967) 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, 282496 + ... + 286784.

It is an arithmetic number, because the mean of its divisors is an integer number (40135095).

Almost surely, 2^1220820960 is an apocalyptic number.

1220820960 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 1220820960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1926484560).

1220820960 is an abundant number, since it is smaller than the sum of its proper divisors (2632148160).

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

1220820960 is a wasteful number, since it uses less digits than its factorization.

1220820960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4900 (or 4892 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 1220820960 is about 34940.2484249898. The cubic root of 1220820960 is about 1068.7693540492.

The spelling of 1220820960 in words is "one billion, two hundred twenty million, eight hundred twenty thousand, nine hundred sixty".