20802580 has 48 divisors (see below), whose sum is σ = 46738944. Its totient is φ = 7758080.

The previous prime is 20802569. The next prime is 20802631. The reversal of 20802580 is 8520802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18309 + ... + 19411.

It is an arithmetic number, because the mean of its divisors is an integer number (973728).

Almost surely, 2^20802580 is an apocalyptic number.

20802580 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 20802580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23369472).

20802580 is an abundant number, since it is smaller than the sum of its proper divisors (25936364).

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

20802580 is a wasteful number, since it uses less digits than its factorization.

20802580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1176 (or 1174 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 20802580 is about 4560.9845428372. The cubic root of 20802580 is about 275.0251437065.

The spelling of 20802580 in words is "twenty million, eight hundred two thousand, five hundred eighty".