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20321279 = 111997231
BaseRepresentation
bin100110110000…
…1001111111111
31102020102112222
41031201033333
520200240104
62003315555
7334504466
oct115411777
942212488
1020321279
111051a750
12697bbbb
134296734
1429ad9dd
151bb61be
hex13613ff

20321279 has 8 divisors (see below), whose sum is σ = 23335680. Its totient is φ = 17501400.

The previous prime is 20321269. The next prime is 20321293. The reversal of 20321279 is 97212302.

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 20321279 - 24 = 20321263 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 (20321269) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48407 + ... + 48824.

It is an arithmetic number, because the mean of its divisors is an integer number (2916960).

Almost surely, 220321279 is an apocalyptic number.

20321279 is a deficient number, since it is larger than the sum of its proper divisors (3014401).

20321279 is a wasteful number, since it uses less digits than its factorization.

20321279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97261.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 20321279 is about 4507.9129317235. The cubic root of 20321279 is about 272.8875231575.

The spelling of 20321279 in words is "twenty million, three hundred twenty-one thousand, two hundred seventy-nine".

Divisors: 1 11 19 209 97231 1069541 1847389 20321279