20020999601 has 2 divisors, whose sum is σ = 20020999602. Its totient is φ = 20020999600.

The previous prime is 20020999597. The next prime is 20020999633. The reversal of 20020999601 is 10699902002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12768774001 + 7252225600 = 112999^2 + 85160^2 .

It is a cyclic number.

It is not a de Polignac number, because 20020999601 - 2² = 20020999597 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20020999001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010499800 + 10010499801.

It is an arithmetic number, because the mean of its divisors is an integer number (10010499801).

Almost surely, 2^20020999601 is an apocalyptic number.

It is an amenable number.

20020999601 is a deficient number, since it is larger than the sum of its proper divisors (1).

20020999601 is an equidigital number, since it uses as much as digits as its factorization.

20020999601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 38.

The spelling of 20020999601 in words is "twenty billion, twenty million, nine hundred ninety-nine thousand, six hundred one".