20218867 has 2 divisors, whose sum is σ = 20218868. Its totient is φ = 20218866.

The previous prime is 20218859. The next prime is 20218879. The reversal of 20218867 is 76881202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20218867 - 2³ = 20218859 is a prime.

It is equal to p_1283596 and since 20218867 and 1283596 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (20218837) 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 as a sum of consecutive naturals, namely, 10109433 + 10109434.

It is an arithmetic number, because the mean of its divisors is an integer number (10109434).

Almost surely, 2^20218867 is an apocalyptic number.

20218867 is a deficient number, since it is larger than the sum of its proper divisors (1).

20218867 is an equidigital number, since it uses as much as digits as its factorization.

20218867 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 20218867 is about 4496.5394471749. The cubic root of 20218867 is about 272.4283323019.

The spelling of 20218867 in words is "twenty million, two hundred eighteen thousand, eight hundred sixty-seven".