1020000005 has 8 divisors (see below), whose sum is σ = 1230214392. Its totient is φ = 811857088.

The previous prime is 1019999989. The next prime is 1020000011. The reversal of 1020000005 is 5000000201.

It can be written as a sum of positive squares in 4 ways, for example, as 462379009 + 557620996 = 21503^2 + 23614^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1020000005 - 2⁴ = 1019999989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1019999947 and 1020000001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 516782 + ... + 518751.

It is an arithmetic number, because the mean of its divisors is an integer number (153776799).

Almost surely, 2^1020000005 is an apocalyptic number.

It is an amenable number.

1020000005 is a deficient number, since it is larger than the sum of its proper divisors (210214387).

1020000005 is a wasteful number, since it uses less digits than its factorization.

1020000005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1035735.

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

The square root of 1020000005 is about 31937.4389236207. The cubic root of 1020000005 is about 1006.6227112049.

Adding to 1020000005 its reverse (5000000201), we get a palindrome (6020000206).

The spelling of 1020000005 in words is "one billion, twenty million, five", and thus it is an aban number and an uban number.