20315560 has 32 divisors (see below), whose sum is σ = 48117600. Its totient is φ = 7698240.

The previous prime is 20315557. The next prime is 20315569. The reversal of 20315560 is 6551302.

It is a happy number.

It is a super-2 number, since 2×20315560² = 825443956227200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20315569) 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, 12606 + ... + 14125.

It is an arithmetic number, because the mean of its divisors is an integer number (1503675).

Almost surely, 2^20315560 is an apocalyptic number.

20315560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20315560 is an abundant number, since it is smaller than the sum of its proper divisors (27802040).

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

20315560 is a wasteful number, since it uses less digits than its factorization.

20315560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26761 (or 26757 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 20315560 is about 4507.2785580658. The cubic root of 20315560 is about 272.8619212557.

Adding to 20315560 its reverse (6551302), we get a palindrome (26866862).

The spelling of 20315560 in words is "twenty million, three hundred fifteen thousand, five hundred sixty".