20553903 has 12 divisors (see below), whose sum is σ = 29728608. Its totient is φ = 13684320.

The previous prime is 20553893. The next prime is 20553931. The reversal of 20553903 is 30935502.

20553903 is a `hidden beast` number, since 20 + 553 + 90 + 3 = 666.

It is not a de Polignac number, because 20553903 - 2⁴ = 20553887 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20553943) 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 11 ways as a sum of consecutive naturals, for example, 11083 + ... + 12803.

It is an arithmetic number, because the mean of its divisors is an integer number (2477384).

Almost surely, 2^20553903 is an apocalyptic number.

20553903 is a deficient number, since it is larger than the sum of its proper divisors (9174705).

20553903 is a wasteful number, since it uses less digits than its factorization.

20553903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3054 (or 3051 counting only the distinct ones).

The product of its (nonzero) digits is 4050, while the sum is 27.

The square root of 20553903 is about 4533.6412517975. The cubic root of 20553903 is about 273.9248510767.

The spelling of 20553903 in words is "twenty million, five hundred fifty-three thousand, nine hundred three".