20911384 has 24 divisors (see below), whose sum is σ = 42459660. Its totient is φ = 9650784.

The previous prime is 20911339. The next prime is 20911403. The reversal of 20911384 is 48311902.

It is a happy number.

It is a nialpdrome in base 13.

It is a zygodrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6382 + ... + 9085.

Almost surely, 2^20911384 is an apocalyptic number.

It is an amenable number.

20911384 is an abundant number, since it is smaller than the sum of its proper divisors (21548276).

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

20911384 is a wasteful number, since it uses less digits than its factorization.

20911384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15499 (or 15482 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 20911384 is about 4572.8966749753. The cubic root of 20911384 is about 275.5037993422.

The spelling of 20911384 in words is "twenty million, nine hundred eleven thousand, three hundred eighty-four".