20891118 has 16 divisors (see below), whose sum is σ = 41895936. Its totient is φ = 6944760.

The previous prime is 20891093. The next prime is 20891131. The reversal of 20891118 is 81119802.

It is a super-2 number, since 2×20891118² = 872877622579848, which contains 22 as substring.

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, 2248 + ... + 6843.

It is an arithmetic number, because the mean of its divisors is an integer number (2618496).

Almost surely, 2^20891118 is an apocalyptic number.

20891118 is an abundant number, since it is smaller than the sum of its proper divisors (21004818).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20891118 is a wasteful number, since it uses less digits than its factorization.

20891118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9479.

The product of its (nonzero) digits is 1152, while the sum is 30.

The square root of 20891118 is about 4570.6802557169. The cubic root of 20891118 is about 275.4147702492.

The spelling of 20891118 in words is "twenty million, eight hundred ninety-one thousand, one hundred eighteen".