20100101 has 8 divisors (see below), whose sum is σ = 23175744. Its totient is φ = 17075520.

The previous prime is 20100097. The next prime is 20100149. The reversal of 20100101 is 10100102.

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 20100101 - 2² = 20100097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100151) 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, 11915 + ... + 13496.

It is an arithmetic number, because the mean of its divisors is an integer number (2896968).

Almost surely, 2^20100101 is an apocalyptic number.

It is an amenable number.

20100101 is a deficient number, since it is larger than the sum of its proper divisors (3075643).

20100101 is a wasteful number, since it uses less digits than its factorization.

20100101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25531.

The product of its (nonzero) digits is 2, while the sum is 5.

The square root of 20100101 is about 4483.3136182962. The cubic root of 20100101 is about 271.8938680876.

Adding to 20100101 its reverse (10100102), we get a palindrome (30200203).

Subtracting from 20100101 its reverse (10100102), we obtain a palindrome (9999999).

Multiplying 20100101 by its reverse (10100102), we get a palindrome (203013070310302).

The spelling of 20100101 in words is "twenty million, one hundred thousand, one hundred one".