20566000 has 160 divisors (see below), whose sum is σ = 61746048. Its totient is φ = 6451200.

The previous prime is 20565983. The next prime is 20566001. The reversal of 20566000 is 66502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20566001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 181944 + ... + 182056.

Almost surely, 2^20566000 is an apocalyptic number.

20566000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20566000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30873024).

20566000 is an abundant number, since it is smaller than the sum of its proper divisors (41180048).

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

20566000 is a wasteful number, since it uses less digits than its factorization.

20566000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156 (or 140 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 20566000 is about 4534.9751928759. The cubic root of 20566000 is about 273.9785800294.

The spelling of 20566000 in words is "twenty million, five hundred sixty-six thousand".