20951885545 has 8 divisors (see below), whose sum is σ = 25287594696. Its totient is φ = 16664620416.

The previous prime is 20951885533. The next prime is 20951885551. The reversal of 20951885545 is 54558815902.

It can be written as a sum of positive squares in 4 ways, for example, as 13088275216 + 7863610329 = 114404^2 + 88677^2 .

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 20951885545 - 2¹¹ = 20951883497 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20951885492 and 20951885501.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12110052 + ... + 12111781.

It is an arithmetic number, because the mean of its divisors is an integer number (3160949337).

Almost surely, 2^20951885545 is an apocalyptic number.

It is an amenable number.

20951885545 is a deficient number, since it is larger than the sum of its proper divisors (4335709151).

20951885545 is a wasteful number, since it uses less digits than its factorization.

20951885545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24222011.

The product of its (nonzero) digits is 2880000, while the sum is 52.

The spelling of 20951885545 in words is "twenty billion, nine hundred fifty-one million, eight hundred eighty-five thousand, five hundred forty-five".