20150442 has 24 divisors (see below), whose sum is σ = 47018244. Its totient is φ = 6200064.

The previous prime is 20150411. The next prime is 20150443. The reversal of 20150442 is 24405102.

It can be written as a sum of positive squares in 2 ways, for example, as 13995081 + 6155361 = 3741^2 + 2481^2 .

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

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (20150443) 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 11 ways as a sum of consecutive naturals, for example, 42823 + ... + 43290.

Almost surely, 2^20150442 is an apocalyptic number.

20150442 is an abundant number, since it is smaller than the sum of its proper divisors (26867802).

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

20150442 is a wasteful number, since it uses less digits than its factorization.

20150442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86134 (or 86131 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 20150442 is about 4488.9243700468. The cubic root of 20150442 is about 272.1206662567.

Adding to 20150442 its reverse (24405102), we get a palindrome (44555544).

The spelling of 20150442 in words is "twenty million, one hundred fifty thousand, four hundred forty-two".