2015220240 has 120 divisors (see below), whose sum is σ = 7383063168. Its totient is φ = 488536320.

The previous prime is 2015220157. The next prime is 2015220247. The reversal of 2015220240 is 420225102.

2015220240 is a `hidden beast` number, since 201 + 5 + 220 + 240 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×2015220240² = 8122225231411315200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (2015220247) 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 23 ways as a sum of consecutive naturals, for example, 119304 + ... + 135143.

Almost surely, 2^2015220240 is an apocalyptic number.

2015220240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2015220240 is an abundant number, since it is smaller than the sum of its proper divisors (5367842928).

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

2015220240 is a wasteful number, since it uses less digits than its factorization.

2015220240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254477 (or 254468 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 2015220240 is about 44891.2044837293. The cubic root of 2015220240 is about 1263.1090266840.

Adding to 2015220240 its reverse (420225102), we get a palindrome (2435445342).

The spelling of 2015220240 in words is "two billion, fifteen million, two hundred twenty thousand, two hundred forty".