2020199981 has 4 divisors (see below), whose sum is σ = 2139035292. Its totient is φ = 1901364672.

The previous prime is 2020199977. The next prime is 2020200031. The reversal of 2020199981 is 1899910202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1742311081 + 277888900 = 41741^2 + 16670^2 .

It is a cyclic number.

It is not a de Polignac number, because 2020199981 - 2² = 2020199977 is a prime.

It is a super-2 number, since 2×2020199981² = 8162415926464800722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2020199081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59417630 + ... + 59417663.

It is an arithmetic number, because the mean of its divisors is an integer number (534758823).

Almost surely, 2^2020199981 is an apocalyptic number.

It is an amenable number.

2020199981 is a deficient number, since it is larger than the sum of its proper divisors (118835311).

2020199981 is a wasteful number, since it uses less digits than its factorization.

2020199981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118835310.

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 2020199981 is about 44946.6348128533. The cubic root of 2020199981 is about 1264.1485792219.

The spelling of 2020199981 in words is "two billion, twenty million, one hundred ninety-nine thousand, nine hundred eighty-one".