20163888 has 60 divisors (see below), whose sum is σ = 58264128. Its totient is φ = 6503040.

The previous prime is 20163863. The next prime is 20163889. The reversal of 20163888 is 88836102.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (20163889) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2206 + ... + 6722.

Almost surely, 2^20163888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20163888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29132064).

20163888 is an abundant number, since it is smaller than the sum of its proper divisors (38100240).

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

20163888 is a wasteful number, since it uses less digits than its factorization.

20163888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4562 (or 4553 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 20163888 is about 4490.4218064676. The cubic root of 20163888 is about 272.1811797504.

The spelling of 20163888 in words is "twenty million, one hundred sixty-three thousand, eight hundred eighty-eight".