20350321161556 has 12 divisors (see below), whose sum is σ = 35615913217920. Its totient is φ = 10174345956440.

The previous prime is 20350321161509. The next prime is 20350321161619. The reversal of 20350321161556 is 65516112305302.

It is a happy number.

It is a super-2 number, since 2×20350321161556² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203599876 + ... + 203699803.

It is an arithmetic number, because the mean of its divisors is an integer number (2967992768160).

Almost surely, 2^{20350321161556} is an apocalyptic number.

It is an amenable number.

20350321161556 is a deficient number, since it is larger than the sum of its proper divisors (15265592056364).

20350321161556 is a wasteful number, since it uses less digits than its factorization.

20350321161556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407312174 (or 407312172 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 40.

Adding to 20350321161556 its reverse (65516112305302), we get a palindrome (85866433466858).

The spelling of 20350321161556 in words is "twenty trillion, three hundred fifty billion, three hundred twenty-one million, one hundred sixty-one thousand, five hundred fifty-six".