20825580 has 48 divisors (see below), whose sum is σ = 60850944. Its totient is φ = 5311680.

The previous prime is 20825573. The next prime is 20825591. The reversal of 20825580 is 8552802.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 6166 + ... + 8925.

It is an arithmetic number, because the mean of its divisors is an integer number (1267728).

Almost surely, 2^20825580 is an apocalyptic number.

20825580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20825580 is an abundant number, since it is smaller than the sum of its proper divisors (40025364).

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

20825580 is a wasteful number, since it uses less digits than its factorization.

20825580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15126 (or 15124 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 30.

The square root of 20825580 is about 4563.5052317270. The cubic root of 20825580 is about 275.1264652490.

It can be divided in two parts, 208255 and 80, that added together give a triangular number (208335 = T₆₄₅).

The spelling of 20825580 in words is "twenty million, eight hundred twenty-five thousand, five hundred eighty".