20405411 has 8 divisors (see below), whose sum is σ = 23131920. Its totient is φ = 17844192.

The previous prime is 20405387. The next prime is 20405443. The reversal of 20405411 is 11450402.

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

It is not a de Polignac number, because 20405411 - 2¹⁰ = 20404387 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 20405411.

It is not an unprimeable number, because it can be changed into a prime (20405461) 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, 41060 + ... + 41553.

It is an arithmetic number, because the mean of its divisors is an integer number (2891490).

Almost surely, 2^20405411 is an apocalyptic number.

20405411 is a deficient number, since it is larger than the sum of its proper divisors (2726509).

20405411 is a wasteful number, since it uses less digits than its factorization.

20405411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82645.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 20405411 is about 4517.2348843070. The cubic root of 20405411 is about 273.2635979479.

Adding to 20405411 its reverse (11450402), we get a palindrome (31855813).

The spelling of 20405411 in words is "twenty million, four hundred five thousand, four hundred eleven".