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20966253719 = 81612569079
BaseRepresentation
bin10011100001101011…
…111010010010010111
32000010011201001011112
4103201223322102113
5320414330104334
613344243325235
71341364134065
oct234153722227
960104631145
1020966253719
1189899a3814
12409168081b
131c9192a8b8
14102c76b035
1582a9d34ce
hex4e1afa497

20966253719 has 4 divisors (see below), whose sum is σ = 20968830960. Its totient is φ = 20963676480.

The previous prime is 20966253709. The next prime is 20966253733. The reversal of 20966253719 is 91735266902.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20966253719 - 224 = 20949476503 is a prime.

It is a super-2 number, since 2×209662537192 (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20966253709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1276379 + ... + 1292700.

It is an arithmetic number, because the mean of its divisors is an integer number (5242207740).

Almost surely, 220966253719 is an apocalyptic number.

20966253719 is a deficient number, since it is larger than the sum of its proper divisors (2577241).

20966253719 is an equidigital number, since it uses as much as digits as its factorization.

20966253719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2577240.

The product of its (nonzero) digits is 1224720, while the sum is 50.

The spelling of 20966253719 in words is "twenty billion, nine hundred sixty-six million, two hundred fifty-three thousand, seven hundred nineteen".

Divisors: 1 8161 2569079 20966253719