2015021320 has 32 divisors (see below), whose sum is σ = 4882552920. Its totient is φ = 744007680.

The previous prime is 2015021303. The next prime is 2015021347. The reversal of 2015021320 is 231205102.

It can be written as a sum of positive squares in 4 ways, for example, as 1515856356 + 499164964 = 38934^2 + 22342^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2015021294 and 2015021303.

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, 1937001 + ... + 1938040.

Almost surely, 2^2015021320 is an apocalyptic number.

2015021320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2015021320 is an abundant number, since it is smaller than the sum of its proper divisors (2867531600).

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

2015021320 is a wasteful number, since it uses less digits than its factorization.

2015021320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3875065 (or 3875061 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 2015021320 is about 44888.9888502737. The cubic root of 2015021320 is about 1263.0674653185.

Adding to 2015021320 its reverse (231205102), we get a palindrome (2246226422).

The spelling of 2015021320 in words is "two billion, fifteen million, twenty-one thousand, three hundred twenty".