20837944169 has 4 divisors (see below), whose sum is σ = 23814793344. Its totient is φ = 17861094996.

The previous prime is 20837944159. The next prime is 20837944177. The reversal of 20837944169 is 96144973802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20837944169 - 2¹² = 20837940073 is a prime.

It is a super-2 number, since 2×20837944169² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20837944169.

It is not an unprimeable number, because it can be changed into a prime (20837944109) 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, 1488424577 + ... + 1488424590.

It is an arithmetic number, because the mean of its divisors is an integer number (5953698336).

Almost surely, 2^20837944169 is an apocalyptic number.

It is an amenable number.

20837944169 is a deficient number, since it is larger than the sum of its proper divisors (2976849175).

20837944169 is an equidigital number, since it uses as much as digits as its factorization.

20837944169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2976849174.

The product of its (nonzero) digits is 2612736, while the sum is 53.

The spelling of 20837944169 in words is "twenty billion, eight hundred thirty-seven million, nine hundred forty-four thousand, one hundred sixty-nine".