20421359 has 8 divisors (see below), whose sum is σ = 23835648. Its totient is φ = 17131320.

The previous prime is 20421347. The next prime is 20421367. The reversal of 20421359 is 95312402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20421359 - 2⁸ = 20421103 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20421329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30707 + ... + 31364.

It is an arithmetic number, because the mean of its divisors is an integer number (2979456).

Almost surely, 2^20421359 is an apocalyptic number.

20421359 is a deficient number, since it is larger than the sum of its proper divisors (3414289).

20421359 is an equidigital number, since it uses as much as digits as its factorization.

20421359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62125.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 20421359 is about 4518.9997787121. Note that the first 3 decimals coincide. The cubic root of 20421359 is about 273.3347698054.

The spelling of 20421359 in words is "twenty million, four hundred twenty-one thousand, three hundred fifty-nine".