20493564 has 96 divisors (see below), whose sum is σ = 60211200. Its totient is φ = 5390784.

The previous prime is 20493553. The next prime is 20493581. The reversal of 20493564 is 46539402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53317 + ... + 53699.

It is an arithmetic number, because the mean of its divisors is an integer number (627200).

Almost surely, 2^20493564 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 20493564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30105600).

20493564 is an abundant number, since it is smaller than the sum of its proper divisors (39717636).

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

20493564 is a wasteful number, since it uses less digits than its factorization.

20493564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424 (or 408 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 20493564 is about 4526.9817759739. The cubic root of 20493564 is about 273.6565394763.

The spelling of 20493564 in words is "twenty million, four hundred ninety-three thousand, five hundred sixty-four".