20130101 has 4 divisors (see below), whose sum is σ = 21189600. Its totient is φ = 19070604.

The previous prime is 20130079. The next prime is 20130163. The reversal of 20130101 is 10103102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20130101 - 2¹⁸ = 19867957 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 (20130001) 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, 529721 + ... + 529758.

It is an arithmetic number, because the mean of its divisors is an integer number (5297400).

Almost surely, 2^20130101 is an apocalyptic number.

It is an amenable number.

20130101 is a deficient number, since it is larger than the sum of its proper divisors (1059499).

20130101 is a wasteful number, since it uses less digits than its factorization.

20130101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059498.

The product of its (nonzero) digits is 6, while the sum is 8.

The square root of 20130101 is about 4486.6581104426. The cubic root of 20130101 is about 272.0290707467.

Adding to 20130101 its reverse (10103102), we get a palindrome (30233203).

The spelling of 20130101 in words is "twenty million, one hundred thirty thousand, one hundred one".