20221868 has 24 divisors (see below), whose sum is σ = 36645840. Its totient is φ = 9757440.

The previous prime is 20221849. The next prime is 20221879. The reversal of 20221868 is 86812202.

It is a self number, because there is not a number n which added to its sum of digits gives 20221868.

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 7 ways as a sum of consecutive naturals, for example, 14648 + ... + 15968.

It is an arithmetic number, because the mean of its divisors is an integer number (1526910).

Almost surely, 2^20221868 is an apocalyptic number.

It is an amenable number.

20221868 is a deficient number, since it is larger than the sum of its proper divisors (16423972).

20221868 is a wasteful number, since it uses less digits than its factorization.

20221868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1457 (or 1455 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 20221868 is about 4496.8731358578. The cubic root of 20221868 is about 272.4418100927.

The spelling of 20221868 in words is "twenty million, two hundred twenty-one thousand, eight hundred sixty-eight".