20018464 has 48 divisors (see below), whose sum is σ = 41912640. Its totient is φ = 9391360.

The previous prime is 20018459. The next prime is 20018477. The reversal of 20018464 is 46481002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43194 + ... + 43654.

It is an arithmetic number, because the mean of its divisors is an integer number (873180).

Almost surely, 2^20018464 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20018464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20956320).

20018464 is an abundant number, since it is smaller than the sum of its proper divisors (21894176).

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

20018464 is a wasteful number, since it uses less digits than its factorization.

20018464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553 (or 545 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 20018464 is about 4474.1998167270. The cubic root of 20018464 is about 271.5252676453.

Adding to 20018464 its reverse (46481002), we get a palindrome (66499466).

The spelling of 20018464 in words is "twenty million, eighteen thousand, four hundred sixty-four".