201020109 has 8 divisors (see below), whose sum is σ = 269802432. Its totient is φ = 133125600.

The previous prime is 201020101. The next prime is 201020123. The reversal of 201020109 is 901020102.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 201020109 - 2³ = 201020101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201020101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 221424 + ... + 222329.

It is an arithmetic number, because the mean of its divisors is an integer number (33725304).

Almost surely, 2^201020109 is an apocalyptic number.

It is an amenable number.

201020109 is a deficient number, since it is larger than the sum of its proper divisors (68782323).

201020109 is a wasteful number, since it uses less digits than its factorization.

201020109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443907.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 201020109 is about 14178.1560507705. The cubic root of 201020109 is about 585.7961342433.

The spelling of 201020109 in words is "two hundred one million, twenty thousand, one hundred nine".