20489580 has 72 divisors (see below), whose sum is σ = 62899200. Its totient is φ = 5398272.

The previous prime is 20489569. The next prime is 20489587. The reversal of 20489580 is 8598402.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (20489587) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15381 + ... + 16659.

It is an arithmetic number, because the mean of its divisors is an integer number (873600).

Almost surely, 2^20489580 is an apocalyptic number.

20489580 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 20489580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31449600).

20489580 is an abundant number, since it is smaller than the sum of its proper divisors (42409620).

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

20489580 is a wasteful number, since it uses less digits than its factorization.

20489580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1383 (or 1378 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 20489580 is about 4526.5417263072. The cubic root of 20489580 is about 273.6388051556.

It can be divided in two parts, 2048 and 9580, that added together give a triangular number (11628 = T₁₅₂).

The spelling of 20489580 in words is "twenty million, four hundred eighty-nine thousand, five hundred eighty".