20587320 has 192 divisors, whose sum is σ = 74299680. Its totient is φ = 4912128.

The previous prime is 20587319. The next prime is 20587337. The reversal of 20587320 is 2378502.

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 47 ways as a sum of consecutive naturals, for example, 247999 + ... + 248081.

Almost surely, 2^20587320 is an apocalyptic number.

20587320 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 20587320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37149840).

20587320 is an abundant number, since it is smaller than the sum of its proper divisors (53712360).

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

20587320 is a wasteful number, since it uses less digits than its factorization.

20587320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166 (or 159 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 20587320 is about 4537.3252032447. The cubic root of 20587320 is about 274.0732217687.

The spelling of 20587320 in words is "twenty million, five hundred eighty-seven thousand, three hundred twenty".