20540101 has 2 divisors, whose sum is σ = 20540102. Its totient is φ = 20540100.

The previous prime is 20540099. The next prime is 20540129. The reversal of 20540101 is 10104502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19589476 + 950625 = 4426^2 + 975^2 .

It is a cyclic number.

It is not a de Polignac number, because 20540101 - 2¹ = 20540099 is a prime.

Together with 20540099, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20540141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10270050 + 10270051.

It is an arithmetic number, because the mean of its divisors is an integer number (10270051).

Almost surely, 2^20540101 is an apocalyptic number.

It is an amenable number.

20540101 is a deficient number, since it is larger than the sum of its proper divisors (1).

20540101 is an equidigital number, since it uses as much as digits as its factorization.

20540101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 20540101 is about 4532.1188201547. The cubic root of 20540101 is about 273.8635235944.

Adding to 20540101 its reverse (10104502), we get a palindrome (30644603).

The spelling of 20540101 in words is "twenty million, five hundred forty thousand, one hundred one".