20820869101 has 2 divisors, whose sum is σ = 20820869102. Its totient is φ = 20820869100.

The previous prime is 20820869099. The next prime is 20820869107. The reversal of 20820869101 is 10196802802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14795073225 + 6025795876 = 121635^2 + 77626^2 .

It is a cyclic number.

It is not a de Polignac number, because 20820869101 - 2¹ = 20820869099 is a prime.

Together with 20820869099, 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 (20820869107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10410434550 + 10410434551.

It is an arithmetic number, because the mean of its divisors is an integer number (10410434551).

Almost surely, 2^20820869101 is an apocalyptic number.

It is an amenable number.

20820869101 is a deficient number, since it is larger than the sum of its proper divisors (1).

20820869101 is an equidigital number, since it uses as much as digits as its factorization.

20820869101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 37.

The spelling of 20820869101 in words is "twenty billion, eight hundred twenty million, eight hundred sixty-nine thousand, one hundred one".