1020002005 has 16 divisors (see below), whose sum is σ = 1335901248. Its totient is φ = 741472000.

The previous prime is 1020001991. The next prime is 1020002017. The reversal of 1020002005 is 5002000201.

It is not a de Polignac number, because 1020002005 - 2¹¹ = 1019999957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1020001982 and 1020002000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204390 + ... + 209320.

It is an arithmetic number, because the mean of its divisors is an integer number (83493828).

Almost surely, 2^1020002005 is an apocalyptic number.

It is an amenable number.

1020002005 is a deficient number, since it is larger than the sum of its proper divisors (315899243).

1020002005 is a wasteful number, since it uses less digits than its factorization.

1020002005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8708.

The product of its (nonzero) digits is 20, while the sum is 10.

The square root of 1020002005 is about 31937.4702348198. The cubic root of 1020002005 is about 1006.6233691278.

Adding to 1020002005 its reverse (5002000201), we get a palindrome (6022002206).

The spelling of 1020002005 in words is "one billion, twenty million, two thousand, five".