20056405 has 8 divisors (see below), whose sum is σ = 24718392. Its totient is φ = 15611328.

The previous prime is 20056403. The next prime is 20056423. The reversal of 20056405 is 50465002.

It can be written as a sum of positive squares in 4 ways, for example, as 2634129 + 17422276 = 1623^2 + 4174^2 .

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 20056405 - 2¹ = 20056403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20056403) 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, 54022 + ... + 54391.

It is an arithmetic number, because the mean of its divisors is an integer number (3089799).

Almost surely, 2^20056405 is an apocalyptic number.

It is an amenable number.

20056405 is a deficient number, since it is larger than the sum of its proper divisors (4661987).

20056405 is a wasteful number, since it uses less digits than its factorization.

20056405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108455.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 20056405 is about 4478.4377856570. The cubic root of 20056405 is about 271.6967000223.

The spelling of 20056405 in words is "twenty million, fifty-six thousand, four hundred five".