20553380 has 24 divisors (see below), whose sum is σ = 43259832. Its totient is φ = 8202752.

The previous prime is 20553361. The next prime is 20553433. The reversal of 20553380 is 8335502.

It can be written as a sum of positive squares in 4 ways, for example, as 2439844 + 18113536 = 1562^2 + 4256^2 .

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, 10994 + ... + 12726.

It is an arithmetic number, because the mean of its divisors is an integer number (1802493).

Almost surely, 2^20553380 is an apocalyptic number.

20553380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20553380 is an abundant number, since it is smaller than the sum of its proper divisors (22706452).

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

20553380 is a wasteful number, since it uses less digits than its factorization.

20553380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2335 (or 2333 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 20553380 is about 4533.5835715248. The cubic root of 20553380 is about 273.9225276913.

Adding to 20553380 its reverse (8335502), we get a palindrome (28888882).

The spelling of 20553380 in words is "twenty million, five hundred fifty-three thousand, three hundred eighty".