20771549 has 8 divisors (see below), whose sum is σ = 21141120. Its totient is φ = 20404800.

The previous prime is 20771539. The next prime is 20771551. The reversal of 20771549 is 94517702.

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 20771549 - 2⁴ = 20771533 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 (20771539) 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, 18494 + ... + 19584.

It is an arithmetic number, because the mean of its divisors is an integer number (2642640).

Almost surely, 2^20771549 is an apocalyptic number.

It is an amenable number.

20771549 is a deficient number, since it is larger than the sum of its proper divisors (369571).

20771549 is a wasteful number, since it uses less digits than its factorization.

20771549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1411.

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 20771549 is about 4557.5814858322. The cubic root of 20771549 is about 274.8883249038. Note that the first 3 decimals are identical.

The spelling of 20771549 in words is "twenty million, seven hundred seventy-one thousand, five hundred forty-nine".