20890846855 has 8 divisors (see below), whose sum is σ = 25069891392. Its totient is φ = 16712094048.

The previous prime is 20890846853. The next prime is 20890846859. The reversal of 20890846855 is 55864809802.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20890846855 - 2¹ = 20890846853 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20890846796 and 20890846805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20890846853) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142434 + ... + 249136.

It is an arithmetic number, because the mean of its divisors is an integer number (3133736424).

Almost surely, 2^20890846855 is an apocalyptic number.

20890846855 is a deficient number, since it is larger than the sum of its proper divisors (4179044537).

20890846855 is a wasteful number, since it uses less digits than its factorization.

20890846855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145865.

The product of its (nonzero) digits is 5529600, while the sum is 55.

The spelling of 20890846855 in words is "twenty billion, eight hundred ninety million, eight hundred forty-six thousand, eight hundred fifty-five".