720020 has 48 divisors (see below), whose sum is σ = 1787520. Its totient is φ = 238464.

The previous prime is 720019. The next prime is 720023. The reversal of 720020 is 20027.

720020 = T₁₀₇ + T₁₀₈ + ... + T₁₇₆.

720020 is nontrivially palindromic in base 6.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 719983 and 720010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5111 + ... + 5249.

It is an arithmetic number, because the mean of its divisors is an integer number (37240).

2⁷²⁰⁰²⁰ is an apocalyptic number.

720020 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 720020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (893760).

720020 is an abundant number, since it is smaller than the sum of its proper divisors (1067500).

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

720020 is a wasteful number, since it uses less digits than its factorization.

720020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192 (or 190 counting only the distinct ones).

The product of its (nonzero) digits is 28, while the sum is 11.

The square root of 720020 is about 848.5399224550. The cubic root of 720020 is about 89.6289248132.

Adding to 720020 its reverse (20027), we get a palindrome (740047).

The spelling of 720020 in words is "seven hundred twenty thousand, twenty", and thus it is an iban number.