20406276439 has 2 divisors, whose sum is σ = 20406276440. Its totient is φ = 20406276438.

The previous prime is 20406276437. The next prime is 20406276461. The reversal of 20406276439 is 93467260402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20406276439 - 2¹ = 20406276437 is a prime.

It is a super-2 number, since 2×20406276439² (a number of 21 digits) contains 22 as substring.

Together with 20406276437, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20406276395 and 20406276404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20406276433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10203138219 + 10203138220.

It is an arithmetic number, because the mean of its divisors is an integer number (10203138220).

Almost surely, 2^20406276439 is an apocalyptic number.

20406276439 is a deficient number, since it is larger than the sum of its proper divisors (1).

20406276439 is an equidigital number, since it uses as much as digits as its factorization.

20406276439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 43.

The spelling of 20406276439 in words is "twenty billion, four hundred six million, two hundred seventy-six thousand, four hundred thirty-nine".