20545124101 has 2 divisors, whose sum is σ = 20545124102. Its totient is φ = 20545124100.

The previous prime is 20545124063. The next prime is 20545124123. The reversal of 20545124101 is 10142154502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19663331076 + 881793025 = 140226^2 + 29695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20545124101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20545124191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10272562050 + 10272562051.

It is an arithmetic number, because the mean of its divisors is an integer number (10272562051).

Almost surely, 2^20545124101 is an apocalyptic number.

It is an amenable number.

20545124101 is a deficient number, since it is larger than the sum of its proper divisors (1).

20545124101 is an equidigital number, since it uses as much as digits as its factorization.

20545124101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1600, while the sum is 25.

Adding to 20545124101 its reverse (10142154502), we get a palindrome (30687278603).

The spelling of 20545124101 in words is "twenty billion, five hundred forty-five million, one hundred twenty-four thousand, one hundred one".