20190720 has 160 divisors (see below), whose sum is σ = 70709760. Its totient is φ = 4874240.

The previous prime is 20190719. The next prime is 20190733. The reversal of 20190720 is 2709102.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (160).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84361 + ... + 84599.

It is an arithmetic number, because the mean of its divisors is an integer number (441936).

Almost surely, 2^20190720 is an apocalyptic number.

20190720 is a gapful number since it is divisible by the number (20) 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 20190720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35354880).

20190720 is an abundant number, since it is smaller than the sum of its proper divisors (50519040).

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

20190720 is a wasteful number, since it uses less digits than its factorization.

20190720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276 (or 260 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 20190720 is about 4493.4085058005. The cubic root of 20190720 is about 272.3018563510.

Adding to 20190720 its reverse (2709102), we get a palindrome (22899822).

It can be divided in two parts, 20190 and 720, that added together give a triangular number (20910 = T₂₀₄).

The spelling of 20190720 in words is "twenty million, one hundred ninety thousand, seven hundred twenty".