20136560 has 20 divisors (see below), whose sum is σ = 46817688. Its totient is φ = 8054592.

The previous prime is 20136553. The next prime is 20136593. The reversal of 20136560 is 6563102.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125774 + ... + 125933.

Almost surely, 2^20136560 is an apocalyptic number.

20136560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20136560 is an abundant number, since it is smaller than the sum of its proper divisors (26681128).

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

20136560 is a wasteful number, since it uses less digits than its factorization.

20136560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251720 (or 251714 counting only the distinct ones).

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

The square root of 20136560 is about 4487.3778534908. The cubic root of 20136560 is about 272.0581623026.

Adding to 20136560 its reverse (6563102), we get a palindrome (26699662).

The spelling of 20136560 in words is "twenty million, one hundred thirty-six thousand, five hundred sixty".