20891110 has 16 divisors (see below), whose sum is σ = 37786032. Its totient is φ = 8316000.

The previous prime is 20891093. The next prime is 20891131. The reversal of 20891110 is 1119802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2841 + ... + 7060.

It is an arithmetic number, because the mean of its divisors is an integer number (2361627).

Almost surely, 2^20891110 is an apocalyptic number.

20891110 is a deficient number, since it is larger than the sum of its proper divisors (16894922).

20891110 is a wasteful number, since it uses less digits than its factorization.

20891110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10119.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 20891110 is about 4570.6793805735. The cubic root of 20891110 is about 275.4147350937.

The spelling of 20891110 in words is "twenty million, eight hundred ninety-one thousand, one hundred ten".