10021720 has 16 divisors (see below), whose sum is σ = 22548960. Its totient is φ = 4008672.

The previous prime is 10021699. The next prime is 10021723. The reversal of 10021720 is 2712001.

10021720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 10021720.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10021723) 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, 125232 + ... + 125311.

It is an arithmetic number, because the mean of its divisors is an integer number (1409310).

Almost surely, 2^10021720 is an apocalyptic number.

10021720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10021720 is an abundant number, since it is smaller than the sum of its proper divisors (12527240).

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

10021720 is a wasteful number, since it uses less digits than its factorization.

10021720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250554 (or 250550 counting only the distinct ones).

The product of its (nonzero) digits is 28, while the sum is 13.

The square root of 10021720 is about 3165.7100309409. The cubic root of 10021720 is about 215.5993372805.

Adding to 10021720 its reverse (2712001), we get a palindrome (12733721).

The spelling of 10021720 in words is "ten million, twenty-one thousand, seven hundred twenty".