20161872 has 100 divisors (see below), whose sum is σ = 59775936. Its totient is φ = 6557760.

The previous prime is 20161871. The next prime is 20161877. The reversal of 20161872 is 27816102.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20161871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 60747 + ... + 61077.

Almost surely, 2^20161872 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 20161872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29887968).

20161872 is an abundant number, since it is smaller than the sum of its proper divisors (39614064).

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

20161872 is a wasteful number, since it uses less digits than its factorization.

20161872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398 (or 383 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 20161872 is about 4490.1973230583. The cubic root of 20161872 is about 272.1721084915.

Adding to 20161872 its reverse (27816102), we get a palindrome (47977974).

The spelling of 20161872 in words is "twenty million, one hundred sixty-one thousand, eight hundred seventy-two".