20855587501 has 8 divisors (see below), whose sum is σ = 23837284224. Its totient is φ = 17874472560.

The previous prime is 20855587483. The next prime is 20855587507. The reversal of 20855587501 is 10578555802.

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

It is not a de Polignac number, because 20855587501 - 2²⁵ = 20822033069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20855587507) 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 7 ways as a sum of consecutive naturals, for example, 65710 + ... + 214543.

It is an arithmetic number, because the mean of its divisors is an integer number (2979660528).

Almost surely, 2^20855587501 is an apocalyptic number.

It is an amenable number.

20855587501 is a deficient number, since it is larger than the sum of its proper divisors (2981696723).

20855587501 is a wasteful number, since it uses less digits than its factorization.

20855587501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290891.

The product of its (nonzero) digits is 560000, while the sum is 46.

The spelling of 20855587501 in words is "twenty billion, eight hundred fifty-five million, five hundred eighty-seven thousand, five hundred one".