20566016 has 26 divisors (see below), whose sum is σ = 41135202. Its totient is φ = 10280960.

The previous prime is 20566001. The next prime is 20566019. The reversal of 20566016 is 61066502.

It can be written as a sum of positive squares in only one way, i.e., 20070400 + 495616 = 4480^2 + 704^2 .

It is a super-2 number, since 2×20566016² = 845922028224512, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20566019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1586 + ... + 6606.

Almost surely, 2^20566016 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 20566016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20567601).

20566016 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20566016 is an frugal number, since it uses more digits than its factorization.

20566016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5045 (or 5023 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 20566016 is about 4534.9769569426. The cubic root of 20566016 is about 273.9786510796.

The spelling of 20566016 in words is "twenty million, five hundred sixty-six thousand, sixteen".