12020016520 has 16 divisors (see below), whose sum is σ = 27045037260. Its totient is φ = 4808006592.

The previous prime is 12020016517. The next prime is 12020016523. The reversal of 12020016520 is 2561002021.

It is an interprime number because it is at equal distance from previous prime (12020016517) and next prime (12020016523).

It can be written as a sum of positive squares in 2 ways, for example, as 11967047236 + 52969284 = 109394^2 + 7278^2 .

It is not an unprimeable number, because it can be changed into a prime (12020016523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150250167 + ... + 150250246.

Almost surely, 2^12020016520 is an apocalyptic number.

12020016520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12020016520 is an abundant number, since it is smaller than the sum of its proper divisors (15025020740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12020016520 is a wasteful number, since it uses less digits than its factorization.

12020016520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300500424 (or 300500420 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 12020016520 its reverse (2561002021), we get a palindrome (14581018541).

The spelling of 12020016520 in words is "twelve billion, twenty million, sixteen thousand, five hundred twenty".