20289855 has 8 divisors (see below), whose sum is σ = 32463792. Its totient is φ = 10821248.

The previous prime is 20289827. The next prime is 20289869. The reversal of 20289855 is 55898202.

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 20289855 - 2⁶ = 20289791 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 676314 + ... + 676343.

It is an arithmetic number, because the mean of its divisors is an integer number (4057974).

Almost surely, 2^20289855 is an apocalyptic number.

20289855 is a deficient number, since it is larger than the sum of its proper divisors (12173937).

20289855 is a wasteful number, since it uses less digits than its factorization.

20289855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1352665.

The product of its (nonzero) digits is 57600, while the sum is 39.

The square root of 20289855 is about 4504.4261565709. The cubic root of 20289855 is about 272.7467898659.

The spelling of 20289855 in words is "twenty million, two hundred eighty-nine thousand, eight hundred fifty-five".