20842663 has 16 divisors (see below), whose sum is σ = 22766400. Its totient is φ = 19008000.

The previous prime is 20842631. The next prime is 20842673. The reversal of 20842663 is 36624802.

It is a cyclic number.

It is not a de Polignac number, because 20842663 - 2⁵ = 20842631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20842603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104638 + ... + 104836.

It is an arithmetic number, because the mean of its divisors is an integer number (1422900).

Almost surely, 2^20842663 is an apocalyptic number.

20842663 is a deficient number, since it is larger than the sum of its proper divisors (1923737).

20842663 is a wasteful number, since it uses less digits than its factorization.

20842663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378.

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 20842663 is about 4565.3765452589. The cubic root of 20842663 is about 275.2016724521.

The spelling of 20842663 in words is "twenty million, eight hundred forty-two thousand, six hundred sixty-three".