20506336101 has 6 divisors (see below), whose sum is σ = 29620263270. Its totient is φ = 13670890728.

The previous prime is 20506336079. The next prime is 20506336111. The reversal of 20506336101 is 10163360502.

20506336101 is a `hidden beast` number, since 20 + 5 + 0 + 633 + 6 + 1 + 0 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20163716001 + 342620100 = 141999^2 + 18510^2 .

It is not a de Polignac number, because 20506336101 - 2¹⁰ = 20506335077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20506336111) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1139240886 + ... + 1139240903.

It is an arithmetic number, because the mean of its divisors is an integer number (4936710545).

Almost surely, 2^20506336101 is an apocalyptic number.

It is an amenable number.

20506336101 is a deficient number, since it is larger than the sum of its proper divisors (9113927169).

20506336101 is a wasteful number, since it uses less digits than its factorization.

20506336101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2278481795 (or 2278481792 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

Adding to 20506336101 its reverse (10163360502), we get a palindrome (30669696603).

The spelling of 20506336101 in words is "twenty billion, five hundred six million, three hundred thirty-six thousand, one hundred one".