1220017520 has 40 divisors (see below), whose sum is σ = 2959873056. Its totient is φ = 466788608.

The previous prime is 1220017511. The next prime is 1220017523. The reversal of 1220017520 is 257100221.

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 (20).

It is a junction number, because it is equal to n+sod(n) for n = 1220017492 and 1220017501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220017523) 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, 329687 + ... + 333366.

Almost surely, 2^1220017520 is an apocalyptic number.

1220017520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220017520 is an abundant number, since it is smaller than the sum of its proper divisors (1739855536).

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

1220017520 is a wasteful number, since it uses less digits than its factorization.

1220017520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663089 (or 663083 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 1220017520 is about 34928.7491903160. The cubic root of 1220017520 is about 1068.5348450536.

Adding to 1220017520 its reverse (257100221), we get a palindrome (1477117741).

The spelling of 1220017520 in words is "one billion, two hundred twenty million, seventeen thousand, five hundred twenty".