20288464 has 40 divisors (see below), whose sum is σ = 45512960. Its totient is φ = 8581248.

The previous prime is 20288459. The next prime is 20288473. The reversal of 20288464 is 46488202.

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, 7702 + ... + 9994.

It is an arithmetic number, because the mean of its divisors is an integer number (1137824).

Almost surely, 2^20288464 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 20288464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22756480).

20288464 is an abundant number, since it is smaller than the sum of its proper divisors (25224496).

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

20288464 is a wasteful number, since it uses less digits than its factorization.

20288464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2387 (or 2381 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 34.

The square root of 20288464 is about 4504.2717502389. The cubic root of 20288464 is about 272.7405568748.

The spelling of 20288464 in words is "twenty million, two hundred eighty-eight thousand, four hundred sixty-four".