20564148 has 48 divisors (see below), whose sum is σ = 53577216. Its totient is φ = 6084960.

The previous prime is 20564147. The next prime is 20564171. The reversal of 20564148 is 84146502.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20564147) 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, 3865 + ... + 7487.

It is an arithmetic number, because the mean of its divisors is an integer number (1116192).

Almost surely, 2^20564148 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 20564148, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26788608).

20564148 is an abundant number, since it is smaller than the sum of its proper divisors (33013068).

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

20564148 is a wasteful number, since it uses less digits than its factorization.

20564148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3684 (or 3682 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 20564148 is about 4534.7709975257. The cubic root of 20564148 is about 273.9703557181.

The spelling of 20564148 in words is "twenty million, five hundred sixty-four thousand, one hundred forty-eight".