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20663859 = 36887953
BaseRepresentation
bin100111011010…
…0111000110011
31102212211111010
41032310320303
520242220414
62014522003
7340432326
oct116647063
942784433
1020663859
1110734077
126b06303
134386648
142a5c7bd
151c32959
hex13b4e33

20663859 has 4 divisors (see below), whose sum is σ = 27551816. Its totient is φ = 13775904.

The previous prime is 20663837. The next prime is 20663861. The reversal of 20663859 is 95836602.

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

It is not a de Polignac number, because 20663859 - 28 = 20663603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20663359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3443974 + ... + 3443979.

It is an arithmetic number, because the mean of its divisors is an integer number (6887954).

Almost surely, 220663859 is an apocalyptic number.

20663859 is a deficient number, since it is larger than the sum of its proper divisors (6887957).

20663859 is an equidigital number, since it uses as much as digits as its factorization.

20663859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6887956.

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 20663859 is about 4545.7517530107. The cubic root of 20663859 is about 274.4124491444.

The spelling of 20663859 in words is "twenty million, six hundred sixty-three thousand, eight hundred fifty-nine".

Divisors: 1 3 6887953 20663859