20009339281 has 4 divisors (see below), whose sum is σ = 20435069952. Its totient is φ = 19583608612.

The previous prime is 20009339249. The next prime is 20009339321. The reversal of 20009339281 is 18293390002.

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 20009339281 - 2⁵ = 20009339249 is a prime.

It is a super-2 number, since 2×20009339281² (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 20009339281.

It is not an unprimeable number, because it can be changed into a prime (20009339381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212865265 + ... + 212865358.

It is an arithmetic number, because the mean of its divisors is an integer number (5108767488).

Almost surely, 2^20009339281 is an apocalyptic number.

It is an amenable number.

20009339281 is a deficient number, since it is larger than the sum of its proper divisors (425730671).

20009339281 is an equidigital number, since it uses as much as digits as its factorization.

20009339281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425730670.

The product of its (nonzero) digits is 23328, while the sum is 37.

The spelling of 20009339281 in words is "twenty billion, nine million, three hundred thirty-nine thousand, two hundred eighty-one".