20218344 has 32 divisors (see below), whose sum is σ = 50656320. Its totient is φ = 6724736.

The previous prime is 20218343. The next prime is 20218349. The reversal of 20218344 is 44381202.

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

It is not an unprimeable number, because it can be changed into a prime (20218343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20077 + ... + 21059.

It is an arithmetic number, because the mean of its divisors is an integer number (1583010).

Almost surely, 2^20218344 is an apocalyptic number.

20218344 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20218344 is an abundant number, since it is smaller than the sum of its proper divisors (30437976).

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

20218344 is a wasteful number, since it uses less digits than its factorization.

20218344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1849 (or 1845 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 20218344 is about 4496.4812909652. The cubic root of 20218344 is about 272.4259833202.

Adding to 20218344 its reverse (44381202), we get a palindrome (64599546).

The spelling of 20218344 in words is "twenty million, two hundred eighteen thousand, three hundred forty-four".