20166588 has 72 divisors (see below), whose sum is σ = 56290416. Its totient is φ = 6048000.

The previous prime is 20166583. The next prime is 20166617. The reversal of 20166588 is 88566102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20166583) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18663 + ... + 19713.

Almost surely, 2^20166588 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 20166588, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28145208).

20166588 is an abundant number, since it is smaller than the sum of its proper divisors (36123828).

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

20166588 is a wasteful number, since it uses less digits than its factorization.

20166588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1115 (or 1110 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 20166588 is about 4490.7224363124. The cubic root of 20166588 is about 272.1933278107.

The spelling of 20166588 in words is "twenty million, one hundred sixty-six thousand, five hundred eighty-eight".