20042201 has 4 divisors (see below), whose sum is σ = 21221172.
Its totient is φ = 18863232.
The previous prime is 20042173. The next prime is 20042249. The reversal of 20042201 is 10224002.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10224002 = 2 ⋅5112001.
It can be written as a sum of positive squares in 2 ways, for example, as 5784025 + 14258176 = 2405^2 + 3776^2
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-20042201 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (20042261) 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, 589460 + ... + 589493.
It is an arithmetic number, because the mean of its divisors is an integer number (5305293).
Almost surely, 220042201 is an apocalyptic number.
It is an amenable number.
20042201 is a deficient number, since it is larger than the sum of its proper divisors (1178971).
20042201 is a wasteful number, since it uses less digits than its factorization.
20042201 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1178970.
The product of its (nonzero) digits is 32, while the sum is 11.
The square root of 20042201 is about 4476.8516839404.
The cubic root of 20042201 is about 271.6325460972.
Adding to 20042201 its reverse (10224002), we get a palindrome (30266203).
The spelling of 20042201 in words is "twenty million, forty-two thousand, two hundred one".