201720036 has 96 divisors (see below), whose sum is σ = 572508160. Its totient is φ = 53996544.

The previous prime is 201719989. The next prime is 201720047. The reversal of 201720036 is 630027102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 201719994 and 201720021.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 154161 + ... + 155463.

Almost surely, 2^201720036 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 201720036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (286254080).

201720036 is an abundant number, since it is smaller than the sum of its proper divisors (370788124).

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

201720036 is a wasteful number, since it uses less digits than its factorization.

201720036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1433 (or 1431 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 201720036 is about 14202.8178894190. The cubic root of 201720036 is about 586.4752364122.

Adding to 201720036 its reverse (630027102), we get a palindrome (831747138).

The spelling of 201720036 in words is "two hundred one million, seven hundred twenty thousand, thirty-six".