20200101 has 16 divisors (see below), whose sum is σ = 27433920.
Its totient is φ = 13219200.
The previous prime is 20200099. The next prime is 20200109. The reversal of 20200101 is 10100202.
Adding to 20200101 its reverse (10100202), we get a palindrome (30300303).
It can be divided in two parts, 20200 and 101, that added together give a triangular number (20301 = T201).
It is a happy number.
It is not a de Polignac number, because 20200101 - 21 = 20200099 is a prime.
It is a Curzon number.
It is a self number, because there is not a number n which added to its sum of digits gives 20200101.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (20200109) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49185 + ... + 49593.
It is an arithmetic number, because the mean of its divisors is an integer number (1714620).
Almost surely, 220200101 is an apocalyptic number.
It is an amenable number.
20200101 is a deficient number, since it is larger than the sum of its proper divisors (7233819).
20200101 is a wasteful number, since it uses less digits than its factorization.
20200101 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 676.
The product of its (nonzero) digits is 4, while the sum is 6.
The square root of 20200101 is about 4494.4522469373.
The cubic root of 20200101 is about 272.3440220621.
The spelling of 20200101 in words is "twenty million, two hundred thousand, one hundred one".