20188806 has 32 divisors (see below), whose sum is σ = 44454528. Its totient is φ = 6061440.

The previous prime is 20188799. The next prime is 20188823. The reversal of 20188806 is 60888102.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6105 + ... + 8811.

It is an arithmetic number, because the mean of its divisors is an integer number (1389204).

Almost surely, 2^20188806 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20188806, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22227264).

20188806 is an abundant number, since it is smaller than the sum of its proper divisors (24265722).

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

20188806 is a wasteful number, since it uses less digits than its factorization.

20188806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2836.

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 20188806 is about 4493.1955221201. The cubic root of 20188806 is about 272.2932517012.

The spelling of 20188806 in words is "twenty million, one hundred eighty-eight thousand, eight hundred six".