20830560 has 48 divisors (see below), whose sum is σ = 65617776. Its totient is φ = 5554688.

The previous prime is 20830549. The next prime is 20830573. The reversal of 20830560 is 6503802.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 20830560.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 21219 + ... + 22178.

It is an arithmetic number, because the mean of its divisors is an integer number (1367037).

Almost surely, 2^20830560 is an apocalyptic number.

20830560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20830560 is an abundant number, since it is smaller than the sum of its proper divisors (44787216).

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

20830560 is a wasteful number, since it uses less digits than its factorization.

20830560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43415 (or 43407 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 20830560 is about 4564.0508323199. The cubic root of 20830560 is about 275.1483937395.

The spelling of 20830560 in words is "twenty million, eight hundred thirty thousand, five hundred sixty".