20236442 has 8 divisors (see below), whose sum is σ = 30374676. Its totient is φ = 10111552.

The previous prime is 20236441. The next prime is 20236451. The reversal of 20236442 is 24463202.

It can be written as a sum of positive squares in 2 ways, for example, as 16883881 + 3352561 = 4109^2 + 1831^2 .

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 (20236441) 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 3 ways as a sum of consecutive naturals, for example, 2498 + ... + 6834.

Almost surely, 2^20236442 is an apocalyptic number.

20236442 is a deficient number, since it is larger than the sum of its proper divisors (10138234).

20236442 is a wasteful number, since it uses less digits than its factorization.

20236442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6672.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 20236442 is about 4498.4933033183. The cubic root of 20236442 is about 272.5072444277.

Adding to 20236442 its reverse (24463202), we get a palindrome (44699644).

The spelling of 20236442 in words is "twenty million, two hundred thirty-six thousand, four hundred forty-two".