100020123 has 96 divisors (see below), whose sum is σ = 190425600. Its totient is φ = 51492672.

The previous prime is 100020121. The next prime is 100020131. The reversal of 100020123 is 321020001.

It is a happy number.

It is not a de Polignac number, because 100020123 - 2¹ = 100020121 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (100020121) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 578065 + ... + 578237.

It is an arithmetic number, because the mean of its divisors is an integer number (1983600).

Almost surely, 2^100020123 is an apocalyptic number.

100020123 is a deficient number, since it is larger than the sum of its proper divisors (90405477).

100020123 is a wasteful number, since it uses less digits than its factorization.

100020123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238 (or 225 counting only the distinct ones).

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

The square root of 100020123 is about 10001.0060993882. The cubic root of 100020123 is about 464.1900155038.

Adding to 100020123 its reverse (321020001), we get a palindrome (421040124).

The spelling of 100020123 in words is "one hundred million, twenty thousand, one hundred twenty-three".