20408312 has 16 divisors (see below), whose sum is σ = 39300360. Its totient is φ = 9928224.

The previous prime is 20408309. The next prime is 20408341. The reversal of 20408312 is 21380402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34178 + ... + 34769.

Almost surely, 2^20408312 is an apocalyptic number.

It is an amenable number.

20408312 is a deficient number, since it is larger than the sum of its proper divisors (18892048).

20408312 is a wasteful number, since it uses less digits than its factorization.

20408312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68990 (or 68986 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 20408312 is about 4517.5559764103. Note that the first 3 decimals coincide. The cubic root of 20408312 is about 273.2765471298.

Adding to 20408312 its reverse (21380402), we get a palindrome (41788714).

The spelling of 20408312 in words is "twenty million, four hundred eight thousand, three hundred twelve".