20818255115 has 16 divisors (see below), whose sum is σ = 28554026688. Its totient is φ = 14273736576.

The previous prime is 20818255109. The next prime is 20818255123. The reversal of 20818255115 is 51155281802.

It is a cyclic number.

It is not a de Polignac number, because 20818255115 - 2⁴ = 20818255099 is a prime.

It is a Duffinian 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 15 ways as a sum of consecutive naturals, for example, 329849 + ... + 387861.

It is an arithmetic number, because the mean of its divisors is an integer number (1784626668).

Almost surely, 2^20818255115 is an apocalyptic number.

20818255115 is a deficient number, since it is larger than the sum of its proper divisors (7735771573).

20818255115 is a wasteful number, since it uses less digits than its factorization.

20818255115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68278.

The product of its (nonzero) digits is 32000, while the sum is 38.

The spelling of 20818255115 in words is "twenty billion, eight hundred eighteen million, two hundred fifty-five thousand, one hundred fifteen".