20020100123 has 4 divisors (see below), whose sum is σ = 20032877760. Its totient is φ = 20007322488.

The previous prime is 20020100081. The next prime is 20020100141. The reversal of 20020100123 is 32100102002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20020100123 - 2¹⁴ = 20020083739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20020120123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6386468 + ... + 6389601.

It is an arithmetic number, because the mean of its divisors is an integer number (5008219440).

Almost surely, 2^20020100123 is an apocalyptic number.

20020100123 is a deficient number, since it is larger than the sum of its proper divisors (12777637).

20020100123 is a wasteful number, since it uses less digits than its factorization.

20020100123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12777636.

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 20020100123 its reverse (32100102002), we get a palindrome (52120202125).

The spelling of 20020100123 in words is "twenty billion, twenty million, one hundred thousand, one hundred twenty-three".