20163560 has 64 divisors (see below), whose sum is σ = 48945600. Its totient is φ = 7451136.

The previous prime is 20163551. The next prime is 20163593. The reversal of 20163560 is 6536102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32372 + ... + 32988.

It is an arithmetic number, because the mean of its divisors is an integer number (764775).

Almost surely, 2^20163560 is an apocalyptic number.

20163560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20163560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24472800).

20163560 is an abundant number, since it is smaller than the sum of its proper divisors (28782040).

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

20163560 is a wasteful number, since it uses less digits than its factorization.

20163560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690 (or 686 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 20163560 is about 4490.3852841377. The cubic root of 20163560 is about 272.1797039121.

Adding to 20163560 its reverse (6536102), we get a palindrome (26699662).

The spelling of 20163560 in words is "twenty million, one hundred sixty-three thousand, five hundred sixty".