20439406 has 32 divisors (see below), whose sum is σ = 35326368. Its totient is φ = 8785920.

The previous prime is 20439379. The next prime is 20439439. The reversal of 20439406 is 60493402.

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, 57726 + ... + 58078.

It is an arithmetic number, because the mean of its divisors is an integer number (1103949).

Almost surely, 2^20439406 is an apocalyptic number.

20439406 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20439406 is a deficient number, since it is larger than the sum of its proper divisors (14886962).

20439406 is a wasteful number, since it uses less digits than its factorization.

20439406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 20439406 is about 4520.9961291733. The cubic root of 20439406 is about 273.4152642882.

It can be divided in two parts, 2043 and 9406, that added together give a square (11449 = 107²).

The spelling of 20439406 in words is "twenty million, four hundred thirty-nine thousand, four hundred six".