20917055995 has 16 divisors (see below), whose sum is σ = 27422468352. Its totient is φ = 15190104160.

The previous prime is 20917055993. The next prime is 20917056029. The reversal of 20917055995 is 59955071902.

It is not a de Polignac number, because 20917055995 - 2¹ = 20917055993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20917055993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 240847 + ... + 315976.

It is an arithmetic number, because the mean of its divisors is an integer number (1713904272).

Almost surely, 2^20917055995 is an apocalyptic number.

20917055995 is a deficient number, since it is larger than the sum of its proper divisors (6505412357).

20917055995 is a wasteful number, since it uses less digits than its factorization.

20917055995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557522.

The product of its (nonzero) digits is 1275750, while the sum is 52.

The spelling of 20917055995 in words is "twenty billion, nine hundred seventeen million, fifty-five thousand, nine hundred ninety-five".