20012405 has 8 divisors (see below), whose sum is σ = 27445632. Its totient is φ = 13722768.

The previous prime is 20012401. The next prime is 20012411. The reversal of 20012405 is 50421002.

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

It is a cyclic number.

It is not a de Polignac number, because 20012405 - 2² = 20012401 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20012405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 285857 + ... + 285926.

It is an arithmetic number, because the mean of its divisors is an integer number (3430704).

Almost surely, 2^20012405 is an apocalyptic number.

It is an amenable number.

20012405 is a deficient number, since it is larger than the sum of its proper divisors (7433227).

20012405 is an equidigital number, since it uses as much as digits as its factorization.

20012405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571795.

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

The square root of 20012405 is about 4473.5226611698. The cubic root of 20012405 is about 271.4978706448.

Adding to 20012405 its reverse (50421002), we get a palindrome (70433407).

The spelling of 20012405 in words is "twenty million, twelve thousand, four hundred five".