20438166 has 32 divisors (see below), whose sum is σ = 46851840. Its totient is φ = 5822496.

The previous prime is 20438161. The next prime is 20438179. The reversal of 20438166 is 66183402.

20438166 = T₂₄₁₃ + T₂₄₁₄ + ... + T₂₄₁₉.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20438161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24240 + ... + 25068.

It is an arithmetic number, because the mean of its divisors is an integer number (1464120).

Almost surely, 2^20438166 is an apocalyptic number.

20438166 is an abundant number, since it is smaller than the sum of its proper divisors (26413674).

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

20438166 is a wasteful number, since it uses less digits than its factorization.

20438166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1428.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 20438166 is about 4520.8589891745. The cubic root of 20438166 is about 273.4097350704.

The spelling of 20438166 in words is "twenty million, four hundred thirty-eight thousand, one hundred sixty-six".