21252205

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{53}}^1\times {\mathrm{199}}^1$

素因数の和:301

約数の個数: 32

約数和(自身を含む): 29030400

約数和(自身を除く): 7778195

約数列:

[1, 5, 13, 31, 53, 65, 155, 199, 265, 403, 689, 995, 1643, 2015, 2587, 3445, 6169, 8215, 10547, 12935, 21359, 30845, 52735, 80197, 106795, 137111, 326957, 400985, 685555, 1634785, 4250441, 21252205]

約数ペア:

[(1, 21252205), (5, 4250441), (13, 1634785), (31, 685555), (53, 400985), (65, 326957), (155, 137111), (199, 106795), (265, 80197), (403, 52735), (689, 30845), (995, 21359), (1643, 12935), (2015, 10547), (2587, 8215), (3445, 6169)]