20288665215 has 256 divisors, whose sum is σ = 49487155200. Its totient is φ = 7632175104.

The previous prime is 20288665193. The next prime is 20288665237. The reversal of 20288665215 is 51256688202.

It is a happy number.

20288665215 is a `hidden beast` number, since 20 + 28 + 86 + 6 + 521 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (20288665193) and next prime (20288665237).

It is not a de Polignac number, because 20288665215 - 2⁵ = 20288665183 is a prime.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 3965499 + ... + 3970611.

It is an arithmetic number, because the mean of its divisors is an integer number (193309200).

Almost surely, 2^20288665215 is an apocalyptic number.

20288665215 is an abundant number, since it is smaller than the sum of its proper divisors (29198489985).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20288665215 is a wasteful number, since it uses less digits than its factorization.

20288665215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5183 (or 5177 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 45.

The spelling of 20288665215 in words is "twenty billion, two hundred eighty-eight million, six hundred sixty-five thousand, two hundred fifteen".