20142646 has 8 divisors (see below), whose sum is σ = 31255920. Its totient is φ = 9724008.

The previous prime is 20142613. The next prime is 20142673. The reversal of 20142646 is 64624102.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20142646.

It is a congruent number.

It is an unprimeable number.

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, 173586 + ... + 173701.

It is an arithmetic number, because the mean of its divisors is an integer number (3906990).

Almost surely, 2^20142646 is an apocalyptic number.

20142646 is a deficient number, since it is larger than the sum of its proper divisors (11113274).

20142646 is a wasteful number, since it uses less digits than its factorization.

20142646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347318.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 20142646 is about 4488.0559265678. The cubic root of 20142646 is about 272.0855681620.

Adding to 20142646 its reverse (64624102), we get a palindrome (84766748).

The spelling of 20142646 in words is "twenty million, one hundred forty-two thousand, six hundred forty-six".