21071907

素因数分解:

$3^4\times {\mathrm{37}}^1\times {\mathrm{79}}^1\times {\mathrm{89}}^1$

素因数の和:217

約数の個数: 40

約数和(自身を含む): 33105600

約数和(自身を除く): 12033693

約数列:

[1, 3, 9, 27, 37, 79, 81, 89, 111, 237, 267, 333, 711, 801, 999, 2133, 2403, 2923, 2997, 3293, 6399, 7031, 7209, 8769, 9879, 21093, 26307, 29637, 63279, 78921, 88911, 189837, 236763, 260147, 266733, 569511, 780441, 2341323, 7023969, 21071907]

約数ペア:

[(1, 21071907), (3, 7023969), (9, 2341323), (27, 780441), (37, 569511), (79, 266733), (81, 260147), (89, 236763), (111, 189837), (237, 88911), (267, 78921), (333, 63279), (711, 29637), (801, 26307), (999, 21093), (2133, 9879), (2403, 8769), (2923, 7209), (2997, 7031), (3293, 6399)]