20835439797 has 4 divisors (see below), whose sum is σ = 27780586400. Its totient is φ = 13890293196.

The previous prime is 20835439739. The next prime is 20835439811. The reversal of 20835439797 is 79793453802.

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 not a de Polignac number, because 20835439797 - 2⁶ = 20835439733 is a prime.

It is a super-2 number, since 2×20835439797² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20835439727) 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, 3472573297 + ... + 3472573302.

It is an arithmetic number, because the mean of its divisors is an integer number (6945146600).

Almost surely, 2^20835439797 is an apocalyptic number.

It is an amenable number.

20835439797 is a deficient number, since it is larger than the sum of its proper divisors (6945146603).

20835439797 is an equidigital number, since it uses as much as digits as its factorization.

20835439797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6945146602.

The product of its (nonzero) digits is 11430720, while the sum is 57.

The spelling of 20835439797 in words is "twenty billion, eight hundred thirty-five million, four hundred thirty-nine thousand, seven hundred ninety-seven".