20855587499 has 16 divisors (see below), whose sum is σ = 21741230016. Its totient is φ = 19987430400.

The previous prime is 20855587483. The next prime is 20855587507. The reversal of 20855587499 is 99478555802.

It is a cyclic number.

It is not a de Polignac number, because 20855587499 - 2⁴ = 20855587483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20855587409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3404159 + ... + 3410279.

It is an arithmetic number, because the mean of its divisors is an integer number (1358826876).

Almost surely, 2^20855587499 is an apocalyptic number.

20855587499 is a deficient number, since it is larger than the sum of its proper divisors (885642517).

20855587499 is a wasteful number, since it uses less digits than its factorization.

20855587499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7526.

The product of its (nonzero) digits is 36288000, while the sum is 62.

The spelling of 20855587499 in words is "twenty billion, eight hundred fifty-five million, five hundred eighty-seven thousand, four hundred ninety-nine".