20321236641461 has 16 divisors (see below), whose sum is σ = 23248773197184. Its totient is φ = 17399832113664.

The previous prime is 20321236641451. The next prime is 20321236641463. The reversal of 20321236641461 is 16414663212302.

It is not a de Polignac number, because 20321236641461 - 2²⁶ = 20321169532597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321236641463) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38629346 + ... + 39151868.

It is an arithmetic number, because the mean of its divisors is an integer number (1453048324824).

Almost surely, 2^{20321236641461} is an apocalyptic number.

It is an amenable number.

20321236641461 is a deficient number, since it is larger than the sum of its proper divisors (2927536555723).

20321236641461 is a wasteful number, since it uses less digits than its factorization.

20321236641461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528380.

The product of its (nonzero) digits is 248832, while the sum is 41.

Adding to 20321236641461 its reverse (16414663212302), we get a palindrome (36735899853763).

The spelling of 20321236641461 in words is "twenty trillion, three hundred twenty-one billion, two hundred thirty-six million, six hundred forty-one thousand, four hundred sixty-one".