20817950 has 12 divisors (see below), whose sum is σ = 38721480. Its totient is φ = 8327160.

The previous prime is 20817947. The next prime is 20817959. The reversal of 20817950 is 5971802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20817959) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 208130 + ... + 208229.

It is an arithmetic number, because the mean of its divisors is an integer number (3226790).

Almost surely, 2^20817950 is an apocalyptic number.

20817950 is a deficient number, since it is larger than the sum of its proper divisors (17903530).

20817950 is a wasteful number, since it uses less digits than its factorization.

20817950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416371 (or 416366 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 20817950 is about 4562.6691749457. The cubic root of 20817950 is about 275.0928612014.

The spelling of 20817950 in words is "twenty million, eight hundred seventeen thousand, nine hundred fifty".