20155000549 has 8 divisors (see below), whose sum is σ = 20689625792. Its totient is φ = 19623371040.

The previous prime is 20155000543. The next prime is 20155000583. The reversal of 20155000549 is 94500055102.

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 20155000549 - 2⁷ = 20155000421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20155000549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20155000543) 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, 735297 + ... + 762214.

It is an arithmetic number, because the mean of its divisors is an integer number (2586203224).

Almost surely, 2^20155000549 is an apocalyptic number.

It is an amenable number.

20155000549 is a deficient number, since it is larger than the sum of its proper divisors (534625243).

20155000549 is a wasteful number, since it uses less digits than its factorization.

20155000549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1497867.

The product of its (nonzero) digits is 9000, while the sum is 31.

The spelling of 20155000549 in words is "twenty billion, one hundred fifty-five million, five hundred forty-nine", and thus it is an aban number.