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20662891 is a prime number
BaseRepresentation
bin100111011010…
…0101001101011
31102212210011021
41032310221223
520242203031
62014513311
7340426444
oct116645153
942783137
1020662891
1110733377
126b05837
134386082
142a5c2cb
151c32511
hex13b4a6b

20662891 has 2 divisors, whose sum is σ = 20662892. Its totient is φ = 20662890.

The previous prime is 20662847. The next prime is 20662897. The reversal of 20662891 is 19826602.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20662891 - 215 = 20630123 is a prime.

It is not a weakly prime, because it can be changed into another prime (20662897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10331445 + 10331446.

It is an arithmetic number, because the mean of its divisors is an integer number (10331446).

Almost surely, 220662891 is an apocalyptic number.

20662891 is a deficient number, since it is larger than the sum of its proper divisors (1).

20662891 is an equidigital number, since it uses as much as digits as its factorization.

20662891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 20662891 is about 4545.6452787256. The cubic root of 20662891 is about 274.4081641203.

The spelling of 20662891 in words is "twenty million, six hundred sixty-two thousand, eight hundred ninety-one".