20909371363959 has 48 divisors (see below), whose sum is σ = 30215233557504. Its totient is φ = 12855993321600.

The previous prime is 20909371363913. The next prime is 20909371364041. The reversal of 20909371363959 is 95936317390902.

It is not a de Polignac number, because 20909371363959 - 2¹³ = 20909371355767 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20909371363959.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20909371363759) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4941943374 + ... + 4941947604.

It is an arithmetic number, because the mean of its divisors is an integer number (629484032448).

Almost surely, 2^{20909371363959} is an apocalyptic number.

20909371363959 is a deficient number, since it is larger than the sum of its proper divisors (9305862193545).

20909371363959 is a wasteful number, since it uses less digits than its factorization.

20909371363959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10528 (or 10515 counting only the distinct ones).

The product of its (nonzero) digits is 74401740, while the sum is 66.

The spelling of 20909371363959 in words is "twenty trillion, nine hundred nine billion, three hundred seventy-one million, three hundred sixty-three thousand, nine hundred fifty-nine".