20558532 has 48 divisors (see below), whose sum is σ = 51880640. Its totient is φ = 6314112.

The previous prime is 20558443. The next prime is 20558557. The reversal of 20558532 is 23585502.

It is a self number, because there is not a number n which added to its sum of digits gives 20558532.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7218 + ... + 9654.

Almost surely, 2^20558532 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20558532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25940320).

20558532 is an abundant number, since it is smaller than the sum of its proper divisors (31322108).

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

20558532 is a wasteful number, since it uses less digits than its factorization.

20558532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2500 (or 2498 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 20558532 is about 4534.1517398517. The cubic root of 20558532 is about 273.9454133183.

The spelling of 20558532 in words is "twenty million, five hundred fifty-eight thousand, five hundred thirty-two".