20402420254542 has 24 divisors (see below), whose sum is σ = 44233892839344. Its totient is φ = 6796399220064.

The previous prime is 20402420254507. The next prime is 20402420254603. The reversal of 20402420254542 is 24545202420402.

20402420254542 is a `hidden beast` number, since 2 + 0 + 40 + 2 + 4 + 20 + 2 + 54 + 542 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 20402420254497 and 20402420254506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 367265743 + ... + 367321290.

It is an arithmetic number, because the mean of its divisors is an integer number (1843078868306).

Almost surely, 2^{20402420254542} is an apocalyptic number.

20402420254542 is an abundant number, since it is smaller than the sum of its proper divisors (23831472584802).

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

20402420254542 is a wasteful number, since it uses less digits than its factorization.

20402420254542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734588584 (or 734588581 counting only the distinct ones).

The product of its (nonzero) digits is 204800, while the sum is 36.

Adding to 20402420254542 its reverse (24545202420402), we get a palindrome (44947622674944).

The spelling of 20402420254542 in words is "twenty trillion, four hundred two billion, four hundred twenty million, two hundred fifty-four thousand, five hundred forty-two".