20449806 has 32 divisors (see below), whose sum is σ = 45964800. Its totient is φ = 6018144.

The previous prime is 20449787. The next prime is 20449873. The reversal of 20449806 is 60894402.

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, 3906 + ... + 7493.

It is an arithmetic number, because the mean of its divisors is an integer number (1436400).

Almost surely, 2^20449806 is an apocalyptic number.

20449806 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20449806 is an abundant number, since it is smaller than the sum of its proper divisors (25514994).

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

20449806 is a wasteful number, since it uses less digits than its factorization.

20449806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11440.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 20449806 is about 4522.1461718967. The cubic root of 20449806 is about 273.4616295724.

It can be divided in two parts, 20 and 449806, that added together give a triangular number (449826 = T₉₄₈).

The spelling of 20449806 in words is "twenty million, four hundred forty-nine thousand, eight hundred six".