20553520 has 40 divisors (see below), whose sum is σ = 51465456. Its totient is φ = 7588608.

The previous prime is 20553517. The next prime is 20553521. The reversal of 20553520 is 2535502.

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

It is a junction number, because it is equal to n+sod(n) for n = 20553491 and 20553500.

It is not an unprimeable number, because it can be changed into a prime (20553521) by changing a digit.

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, 8842 + ... + 10921.

Almost surely, 2^20553520 is an apocalyptic number.

20553520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20553520 is an abundant number, since it is smaller than the sum of its proper divisors (30911936).

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

20553520 is a wasteful number, since it uses less digits than its factorization.

20553520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19789 (or 19783 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 22.

The square root of 20553520 is about 4533.5990118227. The cubic root of 20553520 is about 273.9231496339.

The spelling of 20553520 in words is "twenty million, five hundred fifty-three thousand, five hundred twenty".