20420908 has 12 divisors (see below), whose sum is σ = 36053640. Its totient is φ = 10119872.

The previous prime is 20420891. The next prime is 20420921. The reversal of 20420908 is 80902402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22138 + ... + 23041.

It is an arithmetic number, because the mean of its divisors is an integer number (3004470).

Almost surely, 2^20420908 is an apocalyptic number.

It is an amenable number.

20420908 is a deficient number, since it is larger than the sum of its proper divisors (15632732).

20420908 is a wasteful number, since it uses less digits than its factorization.

20420908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45296 (or 45294 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 20420908 is about 4518.9498780137. The cubic root of 20420908 is about 273.3327576166.

It can be divided in two parts, 204 and 20908, that added together give a palindrome (21112).

The spelling of 20420908 in words is "twenty million, four hundred twenty thousand, nine hundred eight".