20530885 has 8 divisors (see below), whose sum is σ = 24975000. Its totient is φ = 16199424.

The previous prime is 20530871. The next prime is 20530889. The reversal of 20530885 is 58803502.

It can be written as a sum of positive squares in 4 ways, for example, as 6796449 + 13734436 = 2607^2 + 3706^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20530885 - 2¹⁵ = 20498117 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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27760 + ... + 28489.

It is an arithmetic number, because the mean of its divisors is an integer number (3121875).

Almost surely, 2^20530885 is an apocalyptic number.

It is an amenable number.

20530885 is a deficient number, since it is larger than the sum of its proper divisors (4444115).

20530885 is an equidigital number, since it uses as much as digits as its factorization.

20530885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56327.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 20530885 is about 4531.1019630990. The cubic root of 20530885 is about 273.8225581385.

The spelling of 20530885 in words is "twenty million, five hundred thirty thousand, eight hundred eighty-five".