201520530 has 48 divisors (see below), whose sum is σ = 529064640. Its totient is φ = 53214624.

The previous prime is 201520493. The next prime is 201520531. The reversal of 201520530 is 35025102.

It is a happy number.

It is a super-2 number, since 2×201520530² = 81221048022961800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (201520531) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1600 + ... + 20139.

It is an arithmetic number, because the mean of its divisors is an integer number (11022180).

Almost surely, 2^201520530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201520530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (264532320).

201520530 is an abundant number, since it is smaller than the sum of its proper divisors (327544110).

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

201520530 is a wasteful number, since it uses less digits than its factorization.

201520530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21855 (or 21852 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 201520530 is about 14195.7926865674. The cubic root of 201520530 is about 586.2818265660.

Adding to 201520530 its reverse (35025102), we get a palindrome (236545632).

The spelling of 201520530 in words is "two hundred one million, five hundred twenty thousand, five hundred thirty".