20930889 has 16 divisors (see below), whose sum is σ = 32547200. Its totient is φ = 11959920.

The previous prime is 20930887. The next prime is 20930891. The reversal of 20930889 is 98803902.

It is an interprime number because it is at equal distance from previous prime (20930887) and next prime (20930891).

It is not a de Polignac number, because 20930889 - 2¹ = 20930887 is a prime.

It is a super-2 number, since 2×20930889² = 876204228660642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20930887) 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 15 ways as a sum of consecutive naturals, for example, 9142 + ... + 11199.

It is an arithmetic number, because the mean of its divisors is an integer number (2034200).

Almost surely, 2^20930889 is an apocalyptic number.

It is an amenable number.

20930889 is a deficient number, since it is larger than the sum of its proper divisors (11616311).

20930889 is an equidigital number, since it uses as much as digits as its factorization.

20930889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20365 (or 20351 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 20930889 is about 4575.0288523680. The cubic root of 20930889 is about 275.5894310362.

The spelling of 20930889 in words is "twenty million, nine hundred thirty thousand, eight hundred eighty-nine".