20170406549 has 16 divisors (see below), whose sum is σ = 20458750080. Its totient is φ = 19884372480.

The previous prime is 20170406513. The next prime is 20170406563. The reversal of 20170406549 is 94560407102.

It is a cyclic number.

It is not a de Polignac number, because 20170406549 - 2²⁰ = 20169357973 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20170466549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31965464 + ... + 31966094.

It is an arithmetic number, because the mean of its divisors is an integer number (1278671880).

Almost surely, 2^20170406549 is an apocalyptic number.

It is an amenable number.

20170406549 is a deficient number, since it is larger than the sum of its proper divisors (288343531).

20170406549 is a wasteful number, since it uses less digits than its factorization.

20170406549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1820.

The product of its (nonzero) digits is 60480, while the sum is 38.

The spelling of 20170406549 in words is "twenty billion, one hundred seventy million, four hundred six thousand, five hundred forty-nine".