20356740407 has 2 divisors, whose sum is σ = 20356740408. Its totient is φ = 20356740406.

The previous prime is 20356740377. The next prime is 20356740409. The reversal of 20356740407 is 70404765302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20356740407 - 2⁶ = 20356740343 is a prime.

Together with 20356740409, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20356740409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10178370203 + 10178370204.

It is an arithmetic number, because the mean of its divisors is an integer number (10178370204).

Almost surely, 2^20356740407 is an apocalyptic number.

20356740407 is a deficient number, since it is larger than the sum of its proper divisors (1).

20356740407 is an equidigital number, since it uses as much as digits as its factorization.

20356740407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 141120, while the sum is 38.

The spelling of 20356740407 in words is "twenty billion, three hundred fifty-six million, seven hundred forty thousand, four hundred seven".