20121205

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{43}}^1\times {\mathrm{313}}^1$

素因数の和:397

約数の個数: 32

約数和(自身を含む): 27853056

約数和(自身を除く): 7731851

約数列:

[1, 5, 13, 23, 43, 65, 115, 215, 299, 313, 559, 989, 1495, 1565, 2795, 4069, 4945, 7199, 12857, 13459, 20345, 35995, 64285, 67295, 93587, 174967, 309557, 467935, 874835, 1547785, 4024241, 20121205]

約数ペア:

[(1, 20121205), (5, 4024241), (13, 1547785), (23, 874835), (43, 467935), (65, 309557), (115, 174967), (215, 93587), (299, 67295), (313, 64285), (559, 35995), (989, 20345), (1495, 13459), (1565, 12857), (2795, 7199), (4069, 4945)]