20553360 has 40 divisors (see below), whose sum is σ = 63716160. Its totient is φ = 5480832.

The previous prime is 20553359. The next prime is 20553361. The reversal of 20553360 is 6335502.

It is an interprime number because it is at equal distance from previous prime (20553359) and next prime (20553361).

It is a tau number, because it is divible by the number of its divisors (40).

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 20553360.

It is not an unprimeable number, because it can be changed into a prime (20553361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42580 + ... + 43059.

It is an arithmetic number, because the mean of its divisors is an integer number (1592904).

Almost surely, 2^20553360 is an apocalyptic number.

20553360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20553360 is an abundant number, since it is smaller than the sum of its proper divisors (43162800).

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

20553360 is a wasteful number, since it uses less digits than its factorization.

20553360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85655 (or 85649 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 24.

The square root of 20553360 is about 4533.5813657637. The cubic root of 20553360 is about 273.9224388421.

Adding to 20553360 its reverse (6335502), we get a palindrome (26888862).

The spelling of 20553360 in words is "twenty million, five hundred fifty-three thousand, three hundred sixty".