20910189 has 8 divisors (see below), whose sum is σ = 28841760. Its totient is φ = 13459376.

The previous prime is 20910179. The next prime is 20910257. The reversal of 20910189 is 98101902.

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 20910189 - 2⁵ = 20910157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20910179) 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 7 ways as a sum of consecutive naturals, for example, 120087 + ... + 120260.

It is an arithmetic number, because the mean of its divisors is an integer number (3605220).

Almost surely, 2^20910189 is an apocalyptic number.

20910189 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

20910189 is a deficient number, since it is larger than the sum of its proper divisors (7931571).

20910189 is a wasteful number, since it uses less digits than its factorization.

20910189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240379.

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 20910189 is about 4572.7660119451. The cubic root of 20910189 is about 275.4985512708.

The spelling of 20910189 in words is "twenty million, nine hundred ten thousand, one hundred eighty-nine".