20561058 has 96 divisors (see below), whose sum is σ = 55935360. Its totient is φ = 5322240.

The previous prime is 20561053. The next prime is 20561069. The reversal of 20561058 is 85016502.

It is not an unprimeable number, because it can be changed into a prime (20561053) 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 47 ways as a sum of consecutive naturals, for example, 61953 + ... + 62283.

It is an arithmetic number, because the mean of its divisors is an integer number (582660).

Almost surely, 2^20561058 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20561058, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27967680).

20561058 is an abundant number, since it is smaller than the sum of its proper divisors (35374302).

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

20561058 is a wasteful number, since it uses less digits than its factorization.

20561058 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392 (or 389 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 20561058 is about 4534.4302839497. The cubic root of 20561058 is about 273.9566326306.

The spelling of 20561058 in words is "twenty million, five hundred sixty-one thousand, fifty-eight".