20261068447 has 4 divisors (see below), whose sum is σ = 20299957776. Its totient is φ = 20222179120.

The previous prime is 20261068423. The next prime is 20261068463. The reversal of 20261068447 is 74486016202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20261068447 - 2¹⁵ = 20261035679 is a prime.

It is a super-2 number, since 2×20261068447² (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 (20261068417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19443883 + ... + 19444924.

It is an arithmetic number, because the mean of its divisors is an integer number (5074989444).

Almost surely, 2^20261068447 is an apocalyptic number.

20261068447 is a deficient number, since it is larger than the sum of its proper divisors (38889329).

20261068447 is an equidigital number, since it uses as much as digits as its factorization.

20261068447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38889328.

The product of its (nonzero) digits is 129024, while the sum is 40.

The spelling of 20261068447 in words is "twenty billion, two hundred sixty-one million, sixty-eight thousand, four hundred forty-seven".