20161242 has 48 divisors (see below), whose sum is σ = 46388160. Its totient is φ = 6310656.

The previous prime is 20161241. The next prime is 20161243. The reversal of 20161242 is 24216102.

It is an interprime number because it is at equal distance from previous prime (20161241) and next prime (20161243).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20161241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56938 + ... + 57290.

It is an arithmetic number, because the mean of its divisors is an integer number (966420).

Almost surely, 2^20161242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20161242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23194080).

20161242 is an abundant number, since it is smaller than the sum of its proper divisors (26226918).

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

20161242 is a wasteful number, since it uses less digits than its factorization.

20161242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547 (or 544 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 20161242 is about 4490.1271696913. The cubic root of 20161242 is about 272.1692735990.

Adding to 20161242 its reverse (24216102), we get a palindrome (44377344).

The spelling of 20161242 in words is "twenty million, one hundred sixty-one thousand, two hundred forty-two".