20406089 has 4 divisors (see below), whose sum is σ = 22261200. Its totient is φ = 18550980.

The previous prime is 20406017. The next prime is 20406107. The reversal of 20406089 is 98060402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20406089 - 2¹⁶ = 20340553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20406289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 927539 + ... + 927560.

It is an arithmetic number, because the mean of its divisors is an integer number (5565300).

Almost surely, 2^20406089 is an apocalyptic number.

It is an amenable number.

20406089 is a deficient number, since it is larger than the sum of its proper divisors (1855111).

20406089 is a wasteful number, since it uses less digits than its factorization.

20406089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1855110.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 20406089 is about 4517.3099295931. The cubic root of 20406089 is about 273.2666244437.

The spelling of 20406089 in words is "twenty million, four hundred six thousand, eighty-nine".