20427808 has 24 divisors (see below), whose sum is σ = 40400640. Its totient is φ = 10167360.

The previous prime is 20427787. The next prime is 20427817. The reversal of 20427808 is 80872402.

It is a self number, because there is not a number n which added to its sum of digits gives 20427808.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6313 + ... + 8983.

It is an arithmetic number, because the mean of its divisors is an integer number (1683360).

Almost surely, 2^20427808 is an apocalyptic number.

It is an amenable number.

20427808 is a deficient number, since it is larger than the sum of its proper divisors (19972832).

20427808 is a wasteful number, since it uses less digits than its factorization.

20427808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2920 (or 2912 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 31.

The square root of 20427808 is about 4519.7132652415. The cubic root of 20427808 is about 273.3635395265.

The spelling of 20427808 in words is "twenty million, four hundred twenty-seven thousand, eight hundred eight".