20381888 has 14 divisors (see below), whose sum is σ = 40445436. Its totient is φ = 10190912.

The previous prime is 20381843. The next prime is 20381891. The reversal of 20381888 is 88818302.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159170 + ... + 159297.

Almost surely, 2^20381888 is an apocalyptic number.

It is an amenable number.

20381888 is a deficient number, since it is larger than the sum of its proper divisors (20063548).

20381888 is an equidigital number, since it uses as much as digits as its factorization.

20381888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318479 (or 318469 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 38.

The square root of 20381888 is about 4514.6304389175. The cubic root of 20381888 is about 273.1585530783.

The spelling of 20381888 in words is "twenty million, three hundred eighty-one thousand, eight hundred eighty-eight".