1200020305 has 16 divisors (see below), whose sum is σ = 1574406144. Its totient is φ = 870814080.

The previous prime is 1200020303. The next prime is 1200020351. The reversal of 1200020305 is 5030200021.

It is not a de Polignac number, because 1200020305 - 2¹ = 1200020303 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1200020303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1264 + ... + 49006.

It is an arithmetic number, because the mean of its divisors is an integer number (98400384).

Almost surely, 2^1200020305 is an apocalyptic number.

It is an amenable number.

1200020305 is a deficient number, since it is larger than the sum of its proper divisors (374385839).

1200020305 is a wasteful number, since it uses less digits than its factorization.

1200020305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48216.

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 1200020305 is about 34641.3092275682. The cubic root of 1200020305 is about 1062.6645628383.

Adding to 1200020305 its reverse (5030200021), we get a palindrome (6230220326).

The spelling of 1200020305 in words is "one billion, two hundred million, twenty thousand, three hundred five".