4020020989 has 2 divisors, whose sum is σ = 4020020990. Its totient is φ = 4020020988.

The previous prime is 4020020987. The next prime is 4020020999. The reversal of 4020020989 is 9890200204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4012208964 + 7812025 = 63342^2 + 2795^2 .

It is a cyclic number.

It is not a de Polignac number, because 4020020989 - 2¹ = 4020020987 is a prime.

Together with 4020020987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4020020987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2010010494 + 2010010495.

It is an arithmetic number, because the mean of its divisors is an integer number (2010010495).

Almost surely, 2^4020020989 is an apocalyptic number.

It is an amenable number.

4020020989 is a deficient number, since it is larger than the sum of its proper divisors (1).

4020020989 is an equidigital number, since it uses as much as digits as its factorization.

4020020989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 4020020989 is about 63403.6354557055. The cubic root of 4020020989 is about 1590.0450904239.

The spelling of 4020020989 in words is "four billion, twenty million, twenty thousand, nine hundred eighty-nine".