20501642 has 8 divisors (see below), whose sum is σ = 35145696. Its totient is φ = 8786412.

The previous prime is 20501641. The next prime is 20501647. The reversal of 20501642 is 24610502.

It is a happy number.

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 (20501641) 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, 732188 + ... + 732215.

It is an arithmetic number, because the mean of its divisors is an integer number (4393212).

Almost surely, 2^20501642 is an apocalyptic number.

20501642 is a deficient number, since it is larger than the sum of its proper divisors (14644054).

20501642 is a wasteful number, since it uses less digits than its factorization.

20501642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1464412.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 20501642 is about 4527.8738940037. The cubic root of 20501642 is about 273.6924907167.

The spelling of 20501642 in words is "twenty million, five hundred one thousand, six hundred forty-two".