20445442544 has 40 divisors (see below), whose sum is σ = 40565796480. Its totient is φ = 9977220288.

The previous prime is 20445442543. The next prime is 20445442561. The reversal of 20445442544 is 44524454402.

It is a super-2 number, since 2×20445442544² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20445442498 and 20445442507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20445442543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 929627 + ... + 951365.

It is an arithmetic number, because the mean of its divisors is an integer number (1014144912).

Almost surely, 2^20445442544 is an apocalyptic number.

It is an amenable number.

20445442544 is a deficient number, since it is larger than the sum of its proper divisors (20120353936).

20445442544 is a wasteful number, since it uses less digits than its factorization.

20445442544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23157 (or 23151 counting only the distinct ones).

The product of its (nonzero) digits is 409600, while the sum is 38.

Adding to 20445442544 its reverse (44524454402), we get a palindrome (64969896946).

The spelling of 20445442544 in words is "twenty billion, four hundred forty-five million, four hundred forty-two thousand, five hundred forty-four".