20406364 has 12 divisors (see below), whose sum is σ = 38957688. Its totient is φ = 9275600.

The previous prime is 20406349. The next prime is 20406367. The reversal of 20406364 is 46360402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20406367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231847 + ... + 231934.

It is an arithmetic number, because the mean of its divisors is an integer number (3246474).

Almost surely, 2^20406364 is an apocalyptic number.

It is an amenable number.

20406364 is a deficient number, since it is larger than the sum of its proper divisors (18551324).

20406364 is a wasteful number, since it uses less digits than its factorization.

20406364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463796 (or 463794 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 20406364 is about 4517.3403679599. The cubic root of 20406364 is about 273.2678519855.

Adding to 20406364 its reverse (46360402), we get a palindrome (66766766).

The spelling of 20406364 in words is "twenty million, four hundred six thousand, three hundred sixty-four".