1215260220 has 24 divisors (see below), whose sum is σ = 3402728784. Its totient is φ = 324069376.

The previous prime is 1215260219. The next prime is 1215260237. The reversal of 1215260220 is 220625121.

It is a happy number.

1215260220 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10127109 + ... + 10127228.

It is an arithmetic number, because the mean of its divisors is an integer number (141780366).

Almost surely, 2^1215260220 is an apocalyptic number.

1215260220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215260220 is an abundant number, since it is smaller than the sum of its proper divisors (2187468564).

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

1215260220 is a wasteful number, since it uses less digits than its factorization.

1215260220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20254349 (or 20254347 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1215260220 is about 34860.5826113104. The cubic root of 1215260220 is about 1067.1441649031.

Adding to 1215260220 its reverse (220625121), we get a palindrome (1435885341).

The spelling of 1215260220 in words is "one billion, two hundred fifteen million, two hundred sixty thousand, two hundred twenty".