20810166 has 16 divisors (see below), whose sum is σ = 44822064. Its totient is φ = 6403104.

The previous prime is 20810129. The next prime is 20810177. The reversal of 20810166 is 66101802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133321 + ... + 133476.

It is an arithmetic number, because the mean of its divisors is an integer number (2801379).

Almost surely, 2^20810166 is an apocalyptic number.

20810166 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20810166 is an abundant number, since it is smaller than the sum of its proper divisors (24011898).

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

20810166 is a wasteful number, since it uses less digits than its factorization.

20810166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266815.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 20810166 is about 4561.8160857273. The cubic root of 20810166 is about 275.0585704447.

Adding to 20810166 its reverse (66101802), we get a palindrome (86911968).

The spelling of 20810166 in words is "twenty million, eight hundred ten thousand, one hundred sixty-six".