12940020 has 96 divisors (see below), whose sum is σ = 41610240. Its totient is φ = 3335040.

The previous prime is 12940001. The next prime is 12940073. The reversal of 12940020 is 2004921.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12939975 and 12940002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16354 + ... + 17126.

It is an arithmetic number, because the mean of its divisors is an integer number (433440).

Almost surely, 2^12940020 is an apocalyptic number.

12940020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12940020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20805120).

12940020 is an abundant number, since it is smaller than the sum of its proper divisors (28670220).

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

12940020 is a wasteful number, since it uses less digits than its factorization.

12940020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822 (or 814 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 12940020 is about 3597.2239296435. The cubic root of 12940020 is about 234.7712879673.

Adding to 12940020 its reverse (2004921), we get a palindrome (14944941).

The spelling of 12940020 in words is "twelve million, nine hundred forty thousand, twenty".