20818948 has 24 divisors (see below), whose sum is σ = 38785824. Its totient is φ = 9744000.

The previous prime is 20818921. The next prime is 20818961. The reversal of 20818948 is 84981802.

It is a self number, because there is not a number n which added to its sum of digits gives 20818948.

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 7 ways as a sum of consecutive naturals, for example, 13623 + ... + 15073.

It is an arithmetic number, because the mean of its divisors is an integer number (1616076).

Almost surely, 2^20818948 is an apocalyptic number.

It is an amenable number.

20818948 is a deficient number, since it is larger than the sum of its proper divisors (17966876).

20818948 is a wasteful number, since it uses less digits than its factorization.

20818948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1683 (or 1681 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 20818948 is about 4562.7785394428. The cubic root of 20818948 is about 275.0972570599.

The spelling of 20818948 in words is "twenty million, eight hundred eighteen thousand, nine hundred forty-eight".