20071989 has 32 divisors (see below), whose sum is σ = 34561280. Its totient is φ = 11275200.

The previous prime is 20071963. The next prime is 20071991. The reversal of 20071989 is 98917002.

It is a happy number.

It is not a de Polignac number, because 20071989 - 2¹¹ = 20069941 is a prime.

It is a super-2 number, since 2×20071989² = 805769484832242, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20071189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10659 + ... + 12399.

It is an arithmetic number, because the mean of its divisors is an integer number (1080040).

Almost surely, 2^20071989 is an apocalyptic number.

It is an amenable number.

20071989 is a deficient number, since it is larger than the sum of its proper divisors (14489291).

20071989 is a wasteful number, since it uses less digits than its factorization.

20071989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1818 (or 1812 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 20071989 is about 4480.1773402400. The cubic root of 20071989 is about 271.7670520320.

The spelling of 20071989 in words is "twenty million, seventy-one thousand, nine hundred eighty-nine".