20145560 has 32 divisors (see below), whose sum is σ = 46010160. Its totient is φ = 7936896.

The previous prime is 20145557. The next prime is 20145571. The reversal of 20145560 is 6554102.

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, 1079 + ... + 6438.

Almost surely, 2^20145560 is an apocalyptic number.

20145560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20145560 is an abundant number, since it is smaller than the sum of its proper divisors (25864600).

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

20145560 is a wasteful number, since it uses less digits than its factorization.

20145560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7595 (or 7591 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 20145560 is about 4488.3805542757. The cubic root of 20145560 is about 272.0986882376.

Adding to 20145560 its reverse (6554102), we get a palindrome (26699662).

The spelling of 20145560 in words is "twenty million, one hundred forty-five thousand, five hundred sixty".