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20878591 is a prime number
BaseRepresentation
bin100111110100…
…1010011111111
31110021202001011
41033221103333
520321103331
62023300051
7342315346
oct117512377
943252034
1020878591
1110870438
126baa627
1344302c6
142ab6b5d
151c763b1
hex13e94ff

20878591 has 2 divisors, whose sum is σ = 20878592. Its totient is φ = 20878590.

The previous prime is 20878577. The next prime is 20878603. The reversal of 20878591 is 19587802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20878591 - 29 = 20878079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20878541) 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 as a sum of consecutive naturals, namely, 10439295 + 10439296.

It is an arithmetic number, because the mean of its divisors is an integer number (10439296).

Almost surely, 220878591 is an apocalyptic number.

20878591 is a deficient number, since it is larger than the sum of its proper divisors (1).

20878591 is an equidigital number, since it uses as much as digits as its factorization.

20878591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 20878591 is about 4569.3096852807. The cubic root of 20878591 is about 275.3597099974.

The spelling of 20878591 in words is "twenty million, eight hundred seventy-eight thousand, five hundred ninety-one".