20506548 has 48 divisors (see below), whose sum is σ = 51347520. Its totient is φ = 6349824.

The previous prime is 20506543. The next prime is 20506597. The reversal of 20506548 is 84560502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20506543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11236 + ... + 12932.

It is an arithmetic number, because the mean of its divisors is an integer number (1069740).

Almost surely, 2^20506548 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 20506548, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25673760).

20506548 is an abundant number, since it is smaller than the sum of its proper divisors (30840972).

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

20506548 is a wasteful number, since it uses less digits than its factorization.

20506548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1776 (or 1774 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 20506548 is about 4528.4156169680. The cubic root of 20506548 is about 273.7143203222.

The spelling of 20506548 in words is "twenty million, five hundred six thousand, five hundred forty-eight".