101720 has 16 divisors (see below), whose sum is σ = 228960. Its totient is φ = 40672.

The previous prime is 101719. The next prime is 101723. The reversal of 101720 is 27101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101723) 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, 1232 + ... + 1311.

It is an arithmetic number, because the mean of its divisors is an integer number (14310).

2¹⁰¹⁷²⁰ is an apocalyptic number.

101720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101720 is an abundant number, since it is smaller than the sum of its proper divisors (127240).

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

101720 is a wasteful number, since it uses less digits than its factorization.

101720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2554 (or 2550 counting only the distinct ones).

The product of its (nonzero) digits is 14, while the sum is 11.

The square root of 101720 is about 318.9357302028. The cubic root of 101720 is about 46.6804947683.

Adding to 101720 its reverse (27101), we get a palindrome (128821).

The spelling of 101720 in words is "one hundred one thousand, seven hundred twenty", and thus it is an iban number.