20311201 has 4 divisors (see below), whose sum is σ = 20512404. Its totient is φ = 20110000.

The previous prime is 20311189. The next prime is 20311211. The reversal of 20311201 is 10211302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10732176 + 9579025 = 3276^2 + 3095^2 .

It is a cyclic number.

It is not a de Polignac number, because 20311201 - 2¹¹ = 20309153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20311211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100450 + ... + 100651.

It is an arithmetic number, because the mean of its divisors is an integer number (5128101).

Almost surely, 2^20311201 is an apocalyptic number.

20311201 is the 2016-th centered decagonal number.

It is an amenable number.

20311201 is a deficient number, since it is larger than the sum of its proper divisors (201203).

20311201 is a wasteful number, since it uses less digits than its factorization.

20311201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201202.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 20311201 is about 4506.7949809149. The cubic root of 20311201 is about 272.8424043568.

Adding to 20311201 its reverse (10211302), we get a palindrome (30522503).

The spelling of 20311201 in words is "twenty million, three hundred eleven thousand, two hundred one".