20408036 has 24 divisors (see below), whose sum is σ = 39118464. Its totient is φ = 9238880.

The previous prime is 20408029. The next prime is 20408039. The reversal of 20408036 is 63080402.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20408039) 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, 12101 + ... + 13683.

It is an arithmetic number, because the mean of its divisors is an integer number (1629936).

Almost surely, 2^20408036 is an apocalyptic number.

It is an amenable number.

20408036 is a deficient number, since it is larger than the sum of its proper divisors (18710428).

20408036 is a wasteful number, since it uses less digits than its factorization.

20408036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1891 (or 1889 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 20408036 is about 4517.5254288161. The cubic root of 20408036 is about 273.2753152025.

Adding to 20408036 its reverse (63080402), we get a palindrome (83488438).

The spelling of 20408036 in words is "twenty million, four hundred eight thousand, thirty-six".