20042400442644 has 36 divisors (see below), whose sum is σ = 50668845776640. Its totient is φ = 6679994258640.

The previous prime is 20042400442619. The next prime is 20042400442679. The reversal of 20042400442644 is 44624400424002.

20042400442644 is a `hidden beast` number, since 2 + 0 + 0 + 4 + 2 + 4 + 0 + 0 + 4 + 4 + 2 + 644 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 20042400442599 and 20042400442608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33276084 + ... + 33873035.

It is an arithmetic number, because the mean of its divisors is an integer number (1407467938240).

Almost surely, 2^{20042400442644} is an apocalyptic number.

It is an amenable number.

20042400442644 is an abundant number, since it is smaller than the sum of its proper divisors (30626445333996).

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

20042400442644 is a wasteful number, since it uses less digits than its factorization.

20042400442644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67157420 (or 67157415 counting only the distinct ones).

The product of its (nonzero) digits is 196608, while the sum is 36.

Adding to 20042400442644 its reverse (44624400424002), we get a palindrome (64666800866646).

The spelling of 20042400442644 in words is "twenty trillion, forty-two billion, four hundred million, four hundred forty-two thousand, six hundred forty-four".