20885611 has 4 divisors (see below), whose sum is σ = 20923272. Its totient is φ = 20847952.

The previous prime is 20885609. The next prime is 20885621. The reversal of 20885611 is 11658802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11658802 = 2 ⋅5829401.

It is a cyclic number.

It is not a de Polignac number, because 20885611 - 2¹ = 20885609 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (20885621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17986 + ... + 19111.

It is an arithmetic number, because the mean of its divisors is an integer number (5230818).

Almost surely, 2^20885611 is an apocalyptic number.

20885611 is a deficient number, since it is larger than the sum of its proper divisors (37661).

20885611 is an equidigital number, since it uses as much as digits as its factorization.

20885611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37660.

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 20885611 is about 4570.0777892723. The cubic root of 20885611 is about 275.3905678996.

The spelling of 20885611 in words is "twenty million, eight hundred eighty-five thousand, six hundred eleven".