21271216

素因数分解:

$2^4\times {\mathrm{17}}^1\times {\mathrm{78203}}^1$

素因数の和:78228

約数の個数: 20

約数和(自身を含む): 43637832

約数和(自身を除く): 22366616

約数列:

[1, 2, 4, 8, 16, 17, 34, 68, 136, 272, 78203, 156406, 312812, 625624, 1251248, 1329451, 2658902, 5317804, 10635608, 21271216]

約数ペア:

[(1, 21271216), (2, 10635608), (4, 5317804), (8, 2658902), (16, 1329451), (17, 1251248), (34, 625624), (68, 312812), (136, 156406), (272, 78203)]