20235405 has 16 divisors (see below), whose sum is σ = 33421824. Its totient is φ = 10443840.

The previous prime is 20235403. The next prime is 20235419. The reversal of 20235405 is 50453202.

It is not a de Polignac number, because 20235405 - 2¹ = 20235403 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20235403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21294 + ... + 22223.

It is an arithmetic number, because the mean of its divisors is an integer number (2088864).

Almost surely, 2^20235405 is an apocalyptic number.

It is an amenable number.

20235405 is a deficient number, since it is larger than the sum of its proper divisors (13186419).

20235405 is a wasteful number, since it uses less digits than its factorization.

20235405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43556.

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 20235405 is about 4498.3780410277. The cubic root of 20235405 is about 272.5025895442.

Adding to 20235405 its reverse (50453202), we get a palindrome (70688607).

The spelling of 20235405 in words is "twenty million, two hundred thirty-five thousand, four hundred five".