12020297985 has 24 divisors (see below), whose sum is σ = 20881621800. Its totient is φ = 6396536832.

The previous prime is 12020297969. The next prime is 12020297999. The reversal of 12020297985 is 58979202021.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1886251761 + 10134046224 = 43431^2 + 100668^2 .

It is not a de Polignac number, because 12020297985 - 2⁴ = 12020297969 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 12020297985.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 277254 + ... + 317663.

It is an arithmetic number, because the mean of its divisors is an integer number (870067575).

Almost surely, 2^12020297985 is an apocalyptic number.

12020297985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12020297985 is a deficient number, since it is larger than the sum of its proper divisors (8861323815).

12020297985 is a wasteful number, since it uses less digits than its factorization.

12020297985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595377 (or 595374 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The spelling of 12020297985 in words is "twelve billion, twenty million, two hundred ninety-seven thousand, nine hundred eighty-five".