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20930191 = 195918671
BaseRepresentation
bin100111111010…
…1111010001111
31110101100211021
41033311322033
520324231231
62024335011
7342621652
oct117657217
943340737
1020930191
11108a6187
127014467
13444a939
142acb899
151c86811
hex13f5e8f

20930191 has 8 divisors (see below), whose sum is σ = 22406400. Its totient is φ = 19491480.

The previous prime is 20930183. The next prime is 20930201. The reversal of 20930191 is 19103902.

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 20930191 - 23 = 20930183 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 (20930101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8215 + ... + 10456.

It is an arithmetic number, because the mean of its divisors is an integer number (2800800).

Almost surely, 220930191 is an apocalyptic number.

20930191 is a deficient number, since it is larger than the sum of its proper divisors (1476209).

20930191 is a wasteful number, since it uses less digits than its factorization.

20930191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18749.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 20930191 is about 4574.9525680601. The cubic root of 20930191 is about 275.5863675644.

The spelling of 20930191 in words is "twenty million, nine hundred thirty thousand, one hundred ninety-one".

Divisors: 1 19 59 1121 18671 354749 1101589 20930191