20753311909 has 4 divisors (see below), whose sum is σ = 22639976640. Its totient is φ = 18866647180.

The previous prime is 20753311883. The next prime is 20753311927. The reversal of 20753311909 is 90911335702.

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 20753311909 - 2¹⁷ = 20753180837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20753318909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 943332349 + ... + 943332370.

It is an arithmetic number, because the mean of its divisors is an integer number (5659994160).

Almost surely, 2^20753311909 is an apocalyptic number.

It is an amenable number.

20753311909 is a deficient number, since it is larger than the sum of its proper divisors (1886664731).

20753311909 is a wasteful number, since it uses less digits than its factorization.

20753311909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1886664730.

The product of its (nonzero) digits is 51030, while the sum is 40.

The spelling of 20753311909 in words is "twenty billion, seven hundred fifty-three million, three hundred eleven thousand, nine hundred nine".