20200001 has 4 divisors (see below), whose sum is σ = 20248404.
Its totient is φ = 20151600.
The previous prime is 20199973. The next prime is 20200013. The reversal of 20200001 is 10000202.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10000202 = 2 ⋅5000101.
It can be written as a sum of positive squares in 2 ways, for example, as 1752976 + 18447025 = 1324^2 + 4295^2
It is a cyclic number.
It is not a de Polignac number, because 20200001 - 210 = 20198977 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (20200801) 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, 23570 + ... + 24411.
It is an arithmetic number, because the mean of its divisors is an integer number (5062101).
Almost surely, 220200001 is an apocalyptic number.
It is an amenable number.
20200001 is a deficient number, since it is larger than the sum of its proper divisors (48403).
20200001 is an equidigital number, since it uses as much as digits as its factorization.
20200001 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 48402.
The product of its (nonzero) digits is 4, while the sum is 5.
The square root of 20200001 is about 4494.4411220974.
The cubic root of 20200001 is about 272.3435726510.
Adding to 20200001 its reverse (10000202), we get a palindrome (30200203).
Multiplying 20200001 by its reverse (10000202), we get a palindrome (202004090400202).
The spelling of 20200001 in words is "twenty million, two hundred thousand, one".