20975331285 has 12 divisors (see below), whose sum is σ = 36357240972. Its totient is φ = 11186843328.

The previous prime is 20975331281. The next prime is 20975331287. The reversal of 20975331285 is 58213357902.

20975331285 is a `hidden beast` number, since 2 + 0 + 97 + 533 + 1 + 28 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 16562917809 + 4412413476 = 128697^2 + 66426^2 .

It is not a de Polignac number, because 20975331285 - 2² = 20975331281 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 466118473 = 20975331285 / (2 + 0 + 9 + 7 + 5 + 3 + 3 + 1 + 2 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 20975331285.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20975331281) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 233059192 + ... + 233059281.

It is an arithmetic number, because the mean of its divisors is an integer number (3029770081).

Almost surely, 2^20975331285 is an apocalyptic number.

It is an amenable number.

20975331285 is a deficient number, since it is larger than the sum of its proper divisors (15381909687).

20975331285 is a wasteful number, since it uses less digits than its factorization.

20975331285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466118484 (or 466118481 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The spelling of 20975331285 in words is "twenty billion, nine hundred seventy-five million, three hundred thirty-one thousand, two hundred eighty-five".