100020005 has 4 divisors (see below), whose sum is σ = 120024012. Its totient is φ = 80016000.

The previous prime is 100019977. The next prime is 100020023. The reversal of 100020005 is 500020001.

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

It can be written as a sum of positive squares in 2 ways, for example, as 35988001 + 64032004 = 5999^2 + 8002^2 .

It is not a de Polignac number, because 100020005 - 2⁸ = 100019749 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 100019974 and 100020001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10001996 + ... + 10002005.

It is an arithmetic number, because the mean of its divisors is an integer number (30006003).

Almost surely, 2^100020005 is an apocalyptic number.

It is an amenable number.

100020005 is a deficient number, since it is larger than the sum of its proper divisors (20004007).

100020005 is an equidigital number, since it uses as much as digits as its factorization.

100020005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20004006.

The product of its (nonzero) digits is 10, while the sum is 8.

The square root of 100020005 is about 10001.0001999800. Note that the first 3 decimals coincide. The cubic root of 100020005 is about 464.1898329591.

Adding to 100020005 its reverse (500020001), we get a palindrome (600040006).

The spelling of 100020005 in words is "one hundred million, twenty thousand, five".