20747580 has 72 divisors (see below), whose sum is σ = 67587408. Its totient is φ = 4741632.

The previous prime is 20747567. The next prime is 20747581. The reversal of 20747580 is 8574702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20747581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 589 + ... + 6468.

It is an arithmetic number, because the mean of its divisors is an integer number (938714).

Almost surely, 2^20747580 is an apocalyptic number.

20747580 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 20747580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33793704).

20747580 is an abundant number, since it is smaller than the sum of its proper divisors (46839828).

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

20747580 is a wasteful number, since it uses less digits than its factorization.

20747580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7083 (or 7074 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 33.

The square root of 20747580 is about 4554.9511523177. The cubic root of 20747580 is about 274.7825498645.

The spelling of 20747580 in words is "twenty million, seven hundred forty-seven thousand, five hundred eighty".