20438508 has 24 divisors (see below), whose sum is σ = 47860848. Its totient is φ = 6788416.

The previous prime is 20438497. The next prime is 20438521. The reversal of 20438508 is 80583402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 610 + ... + 6422.

It is an arithmetic number, because the mean of its divisors is an integer number (1994202).

Almost surely, 2^20438508 is an apocalyptic number.

It is an amenable number.

20438508 is an abundant number, since it is smaller than the sum of its proper divisors (27422340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20438508 is a wasteful number, since it uses less digits than its factorization.

20438508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6113 (or 6111 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 20438508 is about 4520.8968136864. The cubic root of 20438508 is about 273.4112600866.

The spelling of 20438508 in words is "twenty million, four hundred thirty-eight thousand, five hundred eight".