20438566 has 16 divisors (see below), whose sum is σ = 32468400. Its totient is φ = 9622368.

The previous prime is 20438521. The next prime is 20438567. The reversal of 20438566 is 66583402.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20438567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5020 + ... + 8128.

It is an arithmetic number, because the mean of its divisors is an integer number (2029275).

Almost surely, 2^20438566 is an apocalyptic number.

20438566 is a deficient number, since it is larger than the sum of its proper divisors (12029834).

20438566 is a wasteful number, since it uses less digits than its factorization.

20438566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3303.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 20438566 is about 4520.9032283383. The cubic root of 20438566 is about 273.4115187134.

It can be divided in two parts, 2043 and 8566, that added together give a square (10609 = 103²).

The spelling of 20438566 in words is "twenty million, four hundred thirty-eight thousand, five hundred sixty-six".