201020 has 36 divisors (see below), whose sum is σ = 464520. Its totient is φ = 72864.

The previous prime is 201011. The next prime is 201031. The reversal of 201020 is 20102.

201020 = 155² + 156² + ... + 162².

201020 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (5).

It is a junction number, because it is equal to n+sod(n) for n = 200995 and 201013.

It is a congruent number.

It is an unprimeable number.

201020 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8729 + ... + 8751.

2²⁰¹⁰²⁰ is an apocalyptic number.

201020 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 201020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (232260).

201020 is an abundant number, since it is smaller than the sum of its proper divisors (263500).

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

201020 is a wasteful number, since it uses less digits than its factorization.

201020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74 (or 49 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 5.

The square root of 201020 is about 448.3525398612. The cubic root of 201020 is about 58.5796028364.

Adding to 201020 its reverse (20102), we get a palindrome (221122).

The spelling of 201020 in words is "two hundred one thousand, twenty", and thus it is an iban number.