20865486551 has 8 divisors (see below), whose sum is σ = 25680598944. Its totient is φ = 16508956320.

The previous prime is 20865486533. The next prime is 20865486599. The reversal of 20865486551 is 15568456802.

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 20865486551 - 2²² = 20861292247 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20865486551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20865486451) 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, 114645440 + ... + 114645621.

It is an arithmetic number, because the mean of its divisors is an integer number (3210074868).

Almost surely, 2^20865486551 is an apocalyptic number.

20865486551 is a deficient number, since it is larger than the sum of its proper divisors (4815112393).

20865486551 is a wasteful number, since it uses less digits than its factorization.

20865486551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229291081.

The product of its (nonzero) digits is 2304000, while the sum is 50.

The spelling of 20865486551 in words is "twenty billion, eight hundred sixty-five million, four hundred eighty-six thousand, five hundred fifty-one".