20826715905 has 24 divisors (see below), whose sum is σ = 36867722112. Its totient is φ = 10871249184.

The previous prime is 20826715849. The next prime is 20826715907. The reversal of 20826715905 is 50951762802.

It is not a de Polignac number, because 20826715905 - 2¹¹ = 20826713857 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (20826715907) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4921459 + ... + 4925688.

It is an arithmetic number, because the mean of its divisors is an integer number (1536155088).

Almost surely, 2^20826715905 is an apocalyptic number.

It is an amenable number.

20826715905 is a deficient number, since it is larger than the sum of its proper divisors (16041006207).

20826715905 is a wasteful number, since it uses less digits than its factorization.

20826715905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9847205 (or 9847202 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The spelling of 20826715905 in words is "twenty billion, eight hundred twenty-six million, seven hundred fifteen thousand, nine hundred five".