1320020001 has 12 divisors (see below), whose sum is σ = 1933551360. Its totient is φ = 867618360.

The previous prime is 1320019993. The next prime is 1320020027. The reversal of 1320020001 is 1000200231.

It is a happy number.

It is not a de Polignac number, because 1320020001 - 2³ = 1320019993 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 (1320020201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1032241 + ... + 1033518.

It is an arithmetic number, because the mean of its divisors is an integer number (161129280).

Almost surely, 2^1320020001 is an apocalyptic number.

It is an amenable number.

1320020001 is a deficient number, since it is larger than the sum of its proper divisors (613531359).

1320020001 is a wasteful number, since it uses less digits than its factorization.

1320020001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2065836 (or 2065833 counting only the distinct ones).

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

The square root of 1320020001 is about 36332.0795028306. The cubic root of 1320020001 is about 1096.9668509442.

Adding to 1320020001 its reverse (1000200231), we get a palindrome (2320220232).

The spelling of 1320020001 in words is "one billion, three hundred twenty million, twenty thousand, one".