20218789 has 8 divisors (see below), whose sum is σ = 21316608. Its totient is φ = 19148880.

The previous prime is 20218787. The next prime is 20218799. The reversal of 20218789 is 98781202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20218789 - 2¹ = 20218787 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20218787) by changing a digit.

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, 5482 + ... + 8395.

It is an arithmetic number, because the mean of its divisors is an integer number (2664576).

Almost surely, 2^20218789 is an apocalyptic number.

It is an amenable number.

20218789 is a deficient number, since it is larger than the sum of its proper divisors (1097819).

20218789 is a wasteful number, since it uses less digits than its factorization.

20218789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13955.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 20218789 is about 4496.5307738300. The cubic root of 20218789 is about 272.4279819783.

The spelling of 20218789 in words is "twenty million, two hundred eighteen thousand, seven hundred eighty-nine".