20101242 has 64 divisors (see below), whose sum is σ = 49766400. Its totient is φ = 5281536.

The previous prime is 20101229. The next prime is 20101247. The reversal of 20101242 is 24210102.

It is not an unprimeable number, because it can be changed into a prime (20101247) 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 31 ways as a sum of consecutive naturals, for example, 33259 + ... + 33857.

It is an arithmetic number, because the mean of its divisors is an integer number (777600).

Almost surely, 2^20101242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20101242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24883200).

20101242 is an abundant number, since it is smaller than the sum of its proper divisors (29665158).

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

20101242 is a wasteful number, since it uses less digits than its factorization.

20101242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 20101242 is about 4483.4408661206. The cubic root of 20101242 is about 271.8990127555.

Adding to 20101242 its reverse (24210102), we get a palindrome (44311344).

The spelling of 20101242 in words is "twenty million, one hundred one thousand, two hundred forty-two".