20605800 has 96 divisors (see below), whose sum is σ = 65040480. Its totient is φ = 5395200.

The previous prime is 20605799. The next prime is 20605813. The reversal of 20605800 is 850602.

It is a happy 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 23 ways as a sum of consecutive naturals, for example, 36319 + ... + 36881.

It is an arithmetic number, because the mean of its divisors is an integer number (677505).

Almost surely, 2^20605800 is an apocalyptic number.

20605800 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 20605800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32520240).

20605800 is an abundant number, since it is smaller than the sum of its proper divisors (44434680).

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

20605800 is a wasteful number, since it uses less digits than its factorization.

20605800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643 (or 634 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 20605800 is about 4539.3611885374. The cubic root of 20605800 is about 274.1552035972.

The spelling of 20605800 in words is "twenty million, six hundred five thousand, eight hundred".