20487320 has 64 divisors (see below), whose sum is σ = 55468800. Its totient is φ = 6652800.

The previous prime is 20487317. The next prime is 20487343. The reversal of 20487320 is 2378402.

It is a self number, because there is not a number n which added to its sum of digits gives 20487320.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3395 + ... + 7245.

It is an arithmetic number, because the mean of its divisors is an integer number (866700).

Almost surely, 2^20487320 is an apocalyptic number.

20487320 is a gapful number since it is divisible by the number (20) 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 20487320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27734400).

20487320 is an abundant number, since it is smaller than the sum of its proper divisors (34981480).

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

20487320 is a wasteful number, since it uses less digits than its factorization.

20487320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3888 (or 3884 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 20487320 is about 4526.2920807213. The cubic root of 20487320 is about 273.6287440020.

The spelling of 20487320 in words is "twenty million, four hundred eighty-seven thousand, three hundred twenty".