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12012002020 = 225600600101
BaseRepresentation
bin10110010111111100…
…01001101011100100
31011000010200221000201
423023332021223210
5144100033031040
65303534520244
7603445222024
oct131376115344
934003627021
1012012002020
1151045099a7
1223b2966084
1311957a7705
1481d463a84
154a4841a9a
hex2cbf89ae4

12012002020 has 12 divisors (see below), whose sum is σ = 25225204284. Its totient is φ = 4804800800.

The previous prime is 12012001999. The next prime is 12012002021. The reversal of 12012002020 is 2020021021.

It can be written as a sum of positive squares in 2 ways, for example, as 5297510656 + 6714491364 = 72784^2 + 81942^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 12012001988 and 12012002006.

It is not an unprimeable number, because it can be changed into a prime (12012002021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 300300031 + ... + 300300070.

It is an arithmetic number, because the mean of its divisors is an integer number (2102100357).

Almost surely, 212012002020 is an apocalyptic number.

12012002020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12012002020 is an abundant number, since it is smaller than the sum of its proper divisors (13213202264).

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

12012002020 is a wasteful number, since it uses less digits than its factorization.

12012002020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600600110 (or 600600108 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 12012002020 its reverse (2020021021), we get a palindrome (14032023041).

The spelling of 12012002020 in words is "twelve billion, twelve million, two thousand, twenty".

Divisors: 1 2 4 5 10 20 600600101 1201200202 2402400404 3003000505 6006001010 12012002020