20408812 has 12 divisors (see below), whose sum is σ = 37595320. Its totient is φ = 9667296.

The previous prime is 20408807. The next prime is 20408813. The reversal of 20408812 is 21880402.

It is not an unprimeable number, because it can be changed into a prime (20408813) 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, 134193 + ... + 134344.

Almost surely, 2^20408812 is an apocalyptic number.

It is an amenable number.

20408812 is a deficient number, since it is larger than the sum of its proper divisors (17186508).

20408812 is a wasteful number, since it uses less digits than its factorization.

20408812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268560 (or 268558 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 20408812 is about 4517.6113157287. The cubic root of 20408812 is about 273.2787788538.

The spelling of 20408812 in words is "twenty million, four hundred eight thousand, eight hundred twelve".