20989197333 has 20 divisors (see below), whose sum is σ = 33766098828. Its totient is φ = 12916428480.

The previous prime is 20989197329. The next prime is 20989197337. The reversal of 20989197333 is 33379198902.

It is an interprime number because it is at equal distance from previous prime (20989197329) and next prime (20989197337).

It can be written as a sum of positive squares in 2 ways, for example, as 10569279249 + 10419918084 = 102807^2 + 102078^2 .

It is not a de Polignac number, because 20989197333 - 2² = 20989197329 is a prime.

It is a super-2 number, since 2×20989197333² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20989197333.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20989197337) 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 19 ways as a sum of consecutive naturals, for example, 9965328 + ... + 9967433.

Almost surely, 2^20989197333 is an apocalyptic number.

It is an amenable number.

20989197333 is a deficient number, since it is larger than the sum of its proper divisors (12776901495).

20989197333 is a wasteful number, since it uses less digits than its factorization.

20989197333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19932786 (or 19932777 counting only the distinct ones).

The product of its (nonzero) digits is 2204496, while the sum is 54.

The spelling of 20989197333 in words is "twenty billion, nine hundred eighty-nine million, one hundred ninety-seven thousand, three hundred thirty-three".