20287488 has 104 divisors (see below), whose sum is σ = 58713088. Its totient is φ = 6193152.

The previous prime is 20287483. The next prime is 20287489. The reversal of 20287488 is 88478202.

It is a tau number, because it is divible by the number of its divisors (104).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (20287483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159681 + ... + 159807.

Almost surely, 2^20287488 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 20287488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29356544).

20287488 is an abundant number, since it is smaller than the sum of its proper divisors (38425600).

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

20287488 is a wasteful number, since it uses less digits than its factorization.

20287488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167 (or 145 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 39.

The square root of 20287488 is about 4504.1634073377. The cubic root of 20287488 is about 272.7361833048.

The spelling of 20287488 in words is "twenty million, two hundred eighty-seven thousand, four hundred eighty-eight".