20220191909 has 2 divisors, whose sum is σ = 20220191910. Its totient is φ = 20220191908.

The previous prime is 20220191899. The next prime is 20220191921. The reversal of 20220191909 is 90919102202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19181419009 + 1038772900 = 138497^2 + 32230^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20220191909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20220191209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10110095954 + 10110095955.

It is an arithmetic number, because the mean of its divisors is an integer number (10110095955).

Almost surely, 2^20220191909 is an apocalyptic number.

It is an amenable number.

20220191909 is a deficient number, since it is larger than the sum of its proper divisors (1).

20220191909 is an equidigital number, since it uses as much as digits as its factorization.

20220191909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 35.

The spelling of 20220191909 in words is "twenty billion, two hundred twenty million, one hundred ninety-one thousand, nine hundred nine".