20855416897 has 12 divisors (see below), whose sum is σ = 24279248496. Its totient is φ = 17862170760.

The previous prime is 20855416871. The next prime is 20855416913. The reversal of 20855416897 is 79861455802.

It is a happy number.

It is not a de Polignac number, because 20855416897 - 2¹¹ = 20855414849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20855416807) 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, 101583 + ... + 228100.

It is an arithmetic number, because the mean of its divisors is an integer number (2023270708).

Almost surely, 2^20855416897 is an apocalyptic number.

It is an amenable number.

20855416897 is a deficient number, since it is larger than the sum of its proper divisors (3423831599).

20855416897 is a wasteful number, since it uses less digits than its factorization.

20855416897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330988 (or 330981 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 55.

The spelling of 20855416897 in words is "twenty billion, eight hundred fifty-five million, four hundred sixteen thousand, eight hundred ninety-seven".