28631980

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^2\times {\mathrm{43}}^1\times {\mathrm{197}}^1$

素因数の和:275

約数の個数: 72

約数和(自身を含む): 66960432

約数和(自身を除く): 38328452

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 43, 52, 65, 86, 130, 169, 172, 197, 215, 260, 338, 394, 430, 559, 676, 788, 845, 860, 985, 1118, 1690, 1970, 2236, 2561, 2795, 3380, 3940, 5122, 5590, 7267, 8471, 10244, 11180, 12805, 14534, 16942, 25610, 29068, 33293, 33884, 36335, 42355, 51220, 66586, 72670, 84710, 110123, 133172, 145340, 166465, 169420, 220246, 332930, 440492, 550615, 665860, 1101230, 1431599, 2202460, 2863198, 5726396, 7157995, 14315990, 28631980]

約数ペア:

[(1, 28631980), (2, 14315990), (4, 7157995), (5, 5726396), (10, 2863198), (13, 2202460), (20, 1431599), (26, 1101230), (43, 665860), (52, 550615), (65, 440492), (86, 332930), (130, 220246), (169, 169420), (172, 166465), (197, 145340), (215, 133172), (260, 110123), (338, 84710), (394, 72670), (430, 66586), (559, 51220), (676, 42355), (788, 36335), (845, 33884), (860, 33293), (985, 29068), (1118, 25610), (1690, 16942), (1970, 14534), (2236, 12805), (2561, 11180), (2795, 10244), (3380, 8471), (3940, 7267), (5122, 5590)]