20218704 has 80 divisors (see below), whose sum is σ = 57585600. Its totient is φ = 6062080.

The previous prime is 20218703. The next prime is 20218711. The reversal of 20218704 is 40781202.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20218703) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78544 + ... + 78800.

It is an arithmetic number, because the mean of its divisors is an integer number (719820).

Almost surely, 2^20218704 is an apocalyptic number.

20218704 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20218704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28792800).

20218704 is an abundant number, since it is smaller than the sum of its proper divisors (37366896).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20218704 is a wasteful number, since it uses less digits than its factorization.

20218704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428 (or 422 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 20218704 is about 4496.5213220889. The cubic root of 20218704 is about 272.4276002144.

Adding to 20218704 its reverse (40781202), we get a palindrome (60999906).

The spelling of 20218704 in words is "twenty million, two hundred eighteen thousand, seven hundred four".