20535204101 has 4 divisors (see below), whose sum is σ = 20539603212. Its totient is φ = 20530804992.

The previous prime is 20535204097. The next prime is 20535204127. The reversal of 20535204101 is 10140253502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16991383201 + 3543820900 = 130351^2 + 59530^2 .

It is a cyclic number.

It is not a de Polignac number, because 20535204101 - 2² = 20535204097 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 (20535204301) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2192546 + ... + 2201891.

It is an arithmetic number, because the mean of its divisors is an integer number (5134900803).

Almost surely, 2^20535204101 is an apocalyptic number.

It is an amenable number.

20535204101 is a deficient number, since it is larger than the sum of its proper divisors (4399111).

20535204101 is an equidigital number, since it uses as much as digits as its factorization.

20535204101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4399110.

The product of its (nonzero) digits is 1200, while the sum is 23.

Adding to 20535204101 its reverse (10140253502), we get a palindrome (30675457603).

The spelling of 20535204101 in words is "twenty billion, five hundred thirty-five million, two hundred four thousand, one hundred one".