20408116 has 12 divisors (see below), whose sum is σ = 35942788. Its totient is φ = 10138752.

The previous prime is 20408081. The next prime is 20408117. The reversal of 20408116 is 61180402.

It can be written as a sum of positive squares in 2 ways, for example, as 11587216 + 8820900 = 3404^2 + 2970^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20408117) 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, 15621 + ... + 16876.

Almost surely, 2^20408116 is an apocalyptic number.

It is an amenable number.

20408116 is a deficient number, since it is larger than the sum of its proper divisors (15534672).

20408116 is a wasteful number, since it uses less digits than its factorization.

20408116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32658 (or 32656 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 20408116 is about 4517.5342832125. The cubic root of 20408116 is about 273.2756722841.

Adding to 20408116 its reverse (61180402), we get a palindrome (81588518).

The spelling of 20408116 in words is "twenty million, four hundred eight thousand, one hundred sixteen".