20508198001 has 2 divisors, whose sum is σ = 20508198002. Its totient is φ = 20508198000.

The previous prime is 20508197993. The next prime is 20508198059. The reversal of 20508198001 is 10089180502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20129934400 + 378263601 = 141880^2 + 19449^2 .

It is a cyclic number.

It is not a de Polignac number, because 20508198001 - 2³ = 20508197993 is a prime.

It is not a weakly prime, because it can be changed into another prime (20508198071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10254099000 + 10254099001.

It is an arithmetic number, because the mean of its divisors is an integer number (10254099001).

Almost surely, 2^20508198001 is an apocalyptic number.

It is an amenable number.

20508198001 is a deficient number, since it is larger than the sum of its proper divisors (1).

20508198001 is an equidigital number, since it uses as much as digits as its factorization.

20508198001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 34.

The spelling of 20508198001 in words is "twenty billion, five hundred eight million, one hundred ninety-eight thousand, one".