20220199981 has 2 divisors, whose sum is σ = 20220199982. Its totient is φ = 20220199980.

The previous prime is 20220199957. The next prime is 20220200003. The reversal of 20220199981 is 18999102202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17457015625 + 2763184356 = 132125^2 + 52566^2 .

It is a cyclic number.

It is not a de Polignac number, because 20220199981 - 2²¹ = 20218102829 is a prime.

It is a super-2 number, since 2×20220199981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20220199481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10110099990 + 10110099991.

It is an arithmetic number, because the mean of its divisors is an integer number (10110099991).

Almost surely, 2^20220199981 is an apocalyptic number.

It is an amenable number.

20220199981 is a deficient number, since it is larger than the sum of its proper divisors (1).

20220199981 is an equidigital number, since it uses as much as digits as its factorization.

20220199981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 43.

The spelling of 20220199981 in words is "twenty billion, two hundred twenty million, one hundred ninety-nine thousand, nine hundred eighty-one".