20653888 has 28 divisors (see below), whose sum is σ = 41765220. Its totient is φ = 10130432.

The previous prime is 20653877. The next prime is 20653891. The reversal of 20653888 is 88835602.

It can be written as a sum of positive squares in 2 ways, for example, as 9684544 + 10969344 = 3112^2 + 3312^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20653888.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 348 + ... + 6436.

It is an arithmetic number, because the mean of its divisors is an integer number (1491615).

Almost surely, 2^20653888 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 20653888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20882610).

20653888 is an abundant number, since it is smaller than the sum of its proper divisors (21111332).

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

20653888 is an equidigital number, since it uses as much as digits as its factorization.

20653888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6154 (or 6144 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 20653888 is about 4544.6548823866. The cubic root of 20653888 is about 274.3683043286.

The spelling of 20653888 in words is "twenty million, six hundred fifty-three thousand, eight hundred eighty-eight".