20741580 has 72 divisors (see below), whose sum is σ = 63445200. Its totient is φ = 5484672.

The previous prime is 20741579. The next prime is 20741593. The reversal of 20741580 is 8514702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24606 + ... + 25434.

Almost surely, 2^20741580 is an apocalyptic number.

20741580 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 20741580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31722600).

20741580 is an abundant number, since it is smaller than the sum of its proper divisors (42703620).

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

20741580 is a wasteful number, since it uses less digits than its factorization.

20741580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 983 (or 978 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 20741580 is about 4554.2924807263. The cubic root of 20741580 is about 274.7560591565.

It can be divided in two parts, 20741 and 580, that added together give a triangular number (21321 = T₂₀₆).

The spelling of 20741580 in words is "twenty million, seven hundred forty-one thousand, five hundred eighty".