20136442 has 8 divisors (see below), whose sum is σ = 30482100. Its totient is φ = 9975744.

The previous prime is 20136439. The next prime is 20136443. The reversal of 20136442 is 24463102.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19633761 + 502681 = 4431^2 + 709^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20136443) 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 3 ways as a sum of consecutive naturals, for example, 45967 + ... + 46402.

Almost surely, 2^20136442 is an apocalyptic number.

20136442 is a deficient number, since it is larger than the sum of its proper divisors (10345658).

20136442 is a wasteful number, since it uses less digits than its factorization.

20136442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92480.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 20136442 is about 4487.3647054814. The cubic root of 20136442 is about 272.0576308824.

Adding to 20136442 its reverse (24463102), we get a palindrome (44599544).

The spelling of 20136442 in words is "twenty million, one hundred thirty-six thousand, four hundred forty-two".