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18020197 = 134133809
BaseRepresentation
bin100010010111…
…1011101100101
31020220112001201
41010233131211
514103121242
61442122501
7306112006
oct104573545
936815051
1018020197
11a198928
126050431
13396c250
1425711ad
1518ae4b7
hex112f765

18020197 has 8 divisors (see below), whose sum is σ = 19880280. Its totient is φ = 16227840.

The previous prime is 18020183. The next prime is 18020203. The reversal of 18020197 is 79102081.

It can be written as a sum of positive squares in 4 ways, for example, as 51076 + 17969121 = 226^2 + 4239^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-18020197 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 (18020897) 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, 16372 + ... + 17437.

It is an arithmetic number, because the mean of its divisors is an integer number (2485035).

Almost surely, 218020197 is an apocalyptic number.

It is an amenable number.

18020197 is a deficient number, since it is larger than the sum of its proper divisors (1860083).

18020197 is a wasteful number, since it uses less digits than its factorization.

18020197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33863.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 18020197 is about 4245.0202590800. The cubic root of 18020197 is about 262.1721233636.

The spelling of 18020197 in words is "eighteen million, twenty thousand, one hundred ninety-seven".

Divisors: 1 13 41 533 33809 439517 1386169 18020197