20143642 has 8 divisors (see below), whose sum is σ = 30514932. Its totient is φ = 9972000.

The previous prime is 20143639. The next prime is 20143649. The reversal of 20143642 is 24634102.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19000881 + 1142761 = 4359^2 + 1069^2 .

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 (20143649) 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, 49659 + ... + 50062.

Almost surely, 2^20143642 is an apocalyptic number.

20143642 is a deficient number, since it is larger than the sum of its proper divisors (10371290).

20143642 is a wasteful number, since it uses less digits than its factorization.

20143642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99824.

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

The square root of 20143642 is about 4488.1668863802. The cubic root of 20143642 is about 272.0900527228.

Adding to 20143642 its reverse (24634102), we get a palindrome (44777744).

The spelling of 20143642 in words is "twenty million, one hundred forty-three thousand, six hundred forty-two".