101020 has 12 divisors (see below), whose sum is σ = 212184. Its totient is φ = 40400.

The previous prime is 101009. The next prime is 101021. The reversal of 101020 is 20101.

It is a Harshad number since it is a multiple of its sum of digits (4).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101021) 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, 2506 + ... + 2545.

It is an arithmetic number, because the mean of its divisors is an integer number (17682).

2¹⁰¹⁰²⁰ is an apocalyptic number.

101020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101020 is an abundant number, since it is smaller than the sum of its proper divisors (111164).

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

101020 is a wasteful number, since it uses less digits than its factorization.

101020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5060 (or 5058 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 4.

The square root of 101020 is about 317.8364359226. The cubic root of 101020 is about 46.5731688088.

Adding to 101020 its reverse (20101), we get a palindrome (121121).

The spelling of 101020 in words is "one hundred one thousand, twenty", and thus it is an iban number.