20210103 has 24 divisors (see below), whose sum is σ = 30268368. Its totient is φ = 12984192.

The previous prime is 20210101. The next prime is 20210107. The reversal of 20210103 is 30101202.

It is a happy number.

It is not a de Polignac number, because 20210103 - 2¹ = 20210101 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20210101) 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 23 ways as a sum of consecutive naturals, for example, 45400 + ... + 45842.

It is an arithmetic number, because the mean of its divisors is an integer number (1261182).

Almost surely, 2^20210103 is an apocalyptic number.

20210103 is a deficient number, since it is larger than the sum of its proper divisors (10058265).

20210103 is a wasteful number, since it uses less digits than its factorization.

20210103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623 (or 620 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 20210103 is about 4495.5648143476. The cubic root of 20210103 is about 272.3889646664.

Adding to 20210103 its reverse (30101202), we get a palindrome (50311305).

The spelling of 20210103 in words is "twenty million, two hundred ten thousand, one hundred three".