8201720 has 16 divisors (see below), whose sum is σ = 18453960. Its totient is φ = 3280672.

The previous prime is 8201689. The next prime is 8201729. The reversal of 8201720 is 271028.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 8201692 and 8201701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8201729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102482 + ... + 102561.

Almost surely, 2^8201720 is an apocalyptic number.

It is an amenable number.

8201720 is an abundant number, since it is smaller than the sum of its proper divisors (10252240).

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

8201720 is a wasteful number, since it uses less digits than its factorization.

8201720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205054 (or 205050 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 8201720 is about 2863.8645219354. The cubic root of 8201720 is about 201.6670658493.

Adding to 8201720 its reverse (271028), we get a palindrome (8472748).

The spelling of 8201720 in words is "eight million, two hundred one thousand, seven hundred twenty".