20885699 has 4 divisors (see below), whose sum is σ = 20963040. Its totient is φ = 20808360.

The previous prime is 20885663. The next prime is 20885701. The reversal of 20885699 is 99658802.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20885699 - 2⁸ = 20885443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20885609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38264 + ... + 38805.

It is an arithmetic number, because the mean of its divisors is an integer number (5240760).

Almost surely, 2^20885699 is an apocalyptic number.

20885699 is a deficient number, since it is larger than the sum of its proper divisors (77341).

20885699 is an equidigital number, since it uses as much as digits as its factorization.

20885699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77340.

The product of its (nonzero) digits is 311040, while the sum is 47.

The square root of 20885699 is about 4570.0874171070. The cubic root of 20885699 is about 275.3909546784.

The spelling of 20885699 in words is "twenty million, eight hundred eighty-five thousand, six hundred ninety-nine".