201920 has 28 divisors (see below), whose sum is σ = 481584. Its totient is φ = 80640.

The previous prime is 201919. The next prime is 201923. The reversal of 201920 is 29102.

It is a junction number, because it is equal to n+sod(n) for n = 201895 and 201904.

It is not an unprimeable number, because it can be changed into a prime (201923) 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, 5 + ... + 635.

2²⁰¹⁹²⁰ is an apocalyptic number.

201920 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 201920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (240792).

201920 is an abundant number, since it is smaller than the sum of its proper divisors (279664).

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

201920 is an equidigital number, since it uses as much as digits as its factorization.

201920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648 (or 638 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 201920 is about 449.3550934395. The cubic root of 201920 is about 58.6668962342. Note that the first 3 decimals are identical.

The spelling of 201920 in words is "two hundred one thousand, nine hundred twenty".