1220042320 has 40 divisors (see below), whose sum is σ = 3241828224. Its totient is φ = 418300032.

The previous prime is 1220042303. The next prime is 1220042321. The reversal of 1220042320 is 232400221.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 1220042294 and 1220042303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220042321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1088764 + ... + 1089883.

Almost surely, 2^1220042320 is an apocalyptic number.

1220042320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220042320 is an abundant number, since it is smaller than the sum of its proper divisors (2021785904).

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

1220042320 is a wasteful number, since it uses less digits than its factorization.

1220042320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2178667 (or 2178661 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 1220042320 is about 34929.1041969301. The cubic root of 1220042320 is about 1068.5420852460.

Adding to 1220042320 its reverse (232400221), we get a palindrome (1452442541).

The spelling of 1220042320 in words is "one billion, two hundred twenty million, forty-two thousand, three hundred twenty".