20171349 has 20 divisors (see below), whose sum is σ = 32873280. Its totient is φ = 12224520.

The previous prime is 20171341. The next prime is 20171351. The reversal of 20171349 is 94317102.

It is not a de Polignac number, because 20171349 - 2³ = 20171341 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20171341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10429 + ... + 12210.

It is an arithmetic number, because the mean of its divisors is an integer number (1643664).

Almost surely, 2^20171349 is an apocalyptic number.

It is an amenable number.

20171349 is a deficient number, since it is larger than the sum of its proper divisors (12701931).

20171349 is a wasteful number, since it uses less digits than its factorization.

20171349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22662 (or 22653 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 20171349 is about 4491.2524979119. The cubic root of 20171349 is about 272.2147462491.

Subtracting 20171349 from its reverse (94317102), we obtain a triangular number (74145753 = T₁₂₁₇₇).

The spelling of 20171349 in words is "twenty million, one hundred seventy-one thousand, three hundred forty-nine".