20281424401564 has 24 divisors (see below), whose sum is σ = 37633223169360. Its totient is φ = 9536866482816.

The previous prime is 20281424401531. The next prime is 20281424401571. The reversal of 20281424401564 is 46510442418202.

It is a happy number.

It is a super-2 number, since 2×20281424401564² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20281424401564.

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 7 ways as a sum of consecutive naturals, for example, 973934287 + ... + 973955110.

It is an arithmetic number, because the mean of its divisors is an integer number (1568050965390).

Almost surely, 2^{20281424401564} is an apocalyptic number.

It is an amenable number.

20281424401564 is a deficient number, since it is larger than the sum of its proper divisors (17351798767796).

20281424401564 is a wasteful number, since it uses less digits than its factorization.

20281424401564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1947889557 (or 1947889555 counting only the distinct ones).

The product of its (nonzero) digits is 491520, while the sum is 43.

Adding to 20281424401564 its reverse (46510442418202), we get a palindrome (66791866819766).

The spelling of 20281424401564 in words is "twenty trillion, two hundred eighty-one billion, four hundred twenty-four million, four hundred one thousand, five hundred sixty-four".