20911142 has 48 divisors (see below), whose sum is σ = 38468160. Its totient is φ = 8491392.

The previous prime is 20911129. The next prime is 20911157. The reversal of 20911142 is 24111902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 264659 + ... + 264737.

It is an arithmetic number, because the mean of its divisors is an integer number (801420).

Almost surely, 2^20911142 is an apocalyptic number.

20911142 is a deficient number, since it is larger than the sum of its proper divisors (17557018).

20911142 is a wasteful number, since it uses less digits than its factorization.

20911142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205 (or 198 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 20911142 is about 4572.8702146464. The cubic root of 20911142 is about 275.5027365690.

The spelling of 20911142 in words is "twenty million, nine hundred eleven thousand, one hundred forty-two".