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20117149 = 1310914197
BaseRepresentation
bin100110010111…
…1011010011101
31101212001112121
41030233122131
520122222044
61555102541
7332664403
oct114573235
941761477
1020117149
11103a0348
1268a1a51
134224850
142959473
151b75984
hex132f69d

20117149 has 8 divisors (see below), whose sum is σ = 21864920. Its totient is φ = 18398016.

The previous prime is 20117107. The next prime is 20117161. The reversal of 20117149 is 94171102.

It can be written as a sum of positive squares in 4 ways, for example, as 7193124 + 12924025 = 2682^2 + 3595^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20117149 - 29 = 20116637 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 (20117179) 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, 5682 + ... + 8515.

It is an arithmetic number, because the mean of its divisors is an integer number (2733115).

Almost surely, 220117149 is an apocalyptic number.

It is an amenable number.

20117149 is a deficient number, since it is larger than the sum of its proper divisors (1747771).

20117149 is a wasteful number, since it uses less digits than its factorization.

20117149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14319.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 20117149 is about 4485.2144876249. The cubic root of 20117149 is about 271.9707157415.

The spelling of 20117149 in words is "twenty million, one hundred seventeen thousand, one hundred forty-nine".

Divisors: 1 13 109 1417 14197 184561 1547473 20117149