20180736 has 108 divisors (see below), whose sum is σ = 61381320. Its totient is φ = 6359040.

The previous prime is 20180731. The next prime is 20180737. The reversal of 20180736 is 63708102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20180731) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43546 + ... + 44006.

Almost surely, 2^20180736 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20180736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30690660).

20180736 is an abundant number, since it is smaller than the sum of its proper divisors (41200584).

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

20180736 is a wasteful number, since it uses less digits than its factorization.

20180736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502 (or 485 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 20180736 is about 4492.2974077859. The cubic root of 20180736 is about 272.2569659266.

Adding to 20180736 its reverse (63708102), we get a palindrome (83888838).

The spelling of 20180736 in words is "twenty million, one hundred eighty thousand, seven hundred thirty-six".