20605056 has 64 divisors (see below), whose sum is σ = 57136320. Its totient is φ = 6566912.

The previous prime is 20605043. The next prime is 20605069. The reversal of 20605056 is 65050602.

It is an interprime number because it is at equal distance from previous prime (20605043) and next prime (20605069).

It is a tau number, because it is divible by the number of its divisors (64).

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7666 + ... + 9998.

It is an arithmetic number, because the mean of its divisors is an integer number (892755).

Almost surely, 2^20605056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20605056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28568160).

20605056 is an abundant number, since it is smaller than the sum of its proper divisors (36531264).

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

20605056 is a wasteful number, since it uses less digits than its factorization.

20605056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2373 (or 2361 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 20605056 is about 4539.2792379408. The cubic root of 20605056 is about 274.1519039773.

Adding to 20605056 its reverse (65050602), we get a palindrome (85655658).

The spelling of 20605056 in words is "twenty million, six hundred five thousand, fifty-six".