20683855 has 8 divisors (see below), whose sum is σ = 25016832. Its totient is φ = 16416288.

The previous prime is 20683853. The next prime is 20683879. The reversal of 20683855 is 55838602.

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 20683855 - 2¹ = 20683853 is a prime.

It is a super-2 number, since 2×20683855² = 855643715322050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20683853) 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, 15652 + ... + 16921.

It is an arithmetic number, because the mean of its divisors is an integer number (3127104).

Almost surely, 2^20683855 is an apocalyptic number.

20683855 is a deficient number, since it is larger than the sum of its proper divisors (4332977).

20683855 is a wasteful number, since it uses less digits than its factorization.

20683855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32705.

The product of its (nonzero) digits is 57600, while the sum is 37.

The square root of 20683855 is about 4547.9506373750. The cubic root of 20683855 is about 274.5009350744.

The spelling of 20683855 in words is "twenty million, six hundred eighty-three thousand, eight hundred fifty-five".