20907716245 has 8 divisors (see below), whose sum is σ = 27019202616. Its totient is φ = 15439544256.

The previous prime is 20907716239. The next prime is 20907716273. The reversal of 20907716245 is 54261770902.

It can be written as a sum of positive squares in 4 ways, for example, as 175748049 + 20731968196 = 13257^2 + 143986^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20907716245 - 2²⁵ = 20874161813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160828522 + ... + 160828651.

It is an arithmetic number, because the mean of its divisors is an integer number (3377400327).

Almost surely, 2^20907716245 is an apocalyptic number.

It is an amenable number.

20907716245 is a deficient number, since it is larger than the sum of its proper divisors (6111486371).

20907716245 is a wasteful number, since it uses less digits than its factorization.

20907716245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321657191.

The product of its (nonzero) digits is 211680, while the sum is 43.

The spelling of 20907716245 in words is "twenty billion, nine hundred seven million, seven hundred sixteen thousand, two hundred forty-five".