8720020 has 24 divisors (see below), whose sum is σ = 18547200. Its totient is φ = 3443232.

The previous prime is 8719999. The next prime is 8720027. The reversal of 8720020 is 200278.

8720020 = T₁₄₄ + T₁₄₅ + ... + T₃₈₀.

It is a self number, because there is not a number n which added to its sum of digits gives 8720020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8720027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1180 + ... + 4339.

It is an arithmetic number, because the mean of its divisors is an integer number (772800).

Almost surely, 2^8720020 is an apocalyptic number.

It is an amenable number.

8720020 is an abundant number, since it is smaller than the sum of its proper divisors (9827180).

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

8720020 is a wasteful number, since it uses less digits than its factorization.

8720020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5607 (or 5605 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 8720020 is about 2952.9679984720. The cubic root of 8720020 is about 205.8286506754.

Adding to 8720020 its reverse (200278), we get a palindrome (8920298).

The spelling of 8720020 in words is "eight million, seven hundred twenty thousand, twenty".