20530887 has 32 divisors (see below), whose sum is σ = 31449600. Its totient is φ = 11809152.

The previous prime is 20530871. The next prime is 20530889. The reversal of 20530887 is 78803502.

It is not a de Polignac number, because 20530887 - 2⁴ = 20530871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20530889) 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 31 ways as a sum of consecutive naturals, for example, 76189 + ... + 76457.

It is an arithmetic number, because the mean of its divisors is an integer number (982800).

Almost surely, 2^20530887 is an apocalyptic number.

20530887 is a deficient number, since it is larger than the sum of its proper divisors (10918713).

20530887 is a wasteful number, since it uses less digits than its factorization.

20530887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 20530887 is about 4531.1021837959. The cubic root of 20530887 is about 273.8225670299.

The spelling of 20530887 in words is "twenty million, five hundred thirty thousand, eight hundred eighty-seven".