12020405 has 8 divisors (see below), whose sum is σ = 14889984. Its totient is φ = 9306000.

The previous prime is 12020389. The next prime is 12020417. The reversal of 12020405 is 50402021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12020405 - 2⁴ = 12020389 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12020405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38621 + ... + 38930.

It is an arithmetic number, because the mean of its divisors is an integer number (1861248).

Almost surely, 2^12020405 is an apocalyptic number.

It is an amenable number.

12020405 is a deficient number, since it is larger than the sum of its proper divisors (2869579).

12020405 is an equidigital number, since it uses as much as digits as its factorization.

12020405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77587.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 12020405 is about 3467.0455722416. The cubic root of 12020405 is about 229.0725411064.

Adding to 12020405 its reverse (50402021), we get a palindrome (62422426).

The spelling of 12020405 in words is "twelve million, twenty thousand, four hundred five".