20644501242 has 32 divisors (see below), whose sum is σ = 43738538112. Its totient is φ = 6473629184.

The previous prime is 20644501231. The next prime is 20644501247. The reversal of 20644501242 is 24210544602.

It is not an unprimeable number, because it can be changed into a prime (20644501247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172603 + ... + 266609.

It is an arithmetic number, because the mean of its divisors is an integer number (1366829316).

Almost surely, 2^20644501242 is an apocalyptic number.

20644501242 is an abundant number, since it is smaller than the sum of its proper divisors (23094036870).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20644501242 is a wasteful number, since it uses less digits than its factorization.

20644501242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96182.

The product of its (nonzero) digits is 15360, while the sum is 30.

The spelling of 20644501242 in words is "twenty billion, six hundred forty-four million, five hundred one thousand, two hundred forty-two".