20490561

素因数分解:

$3^2\times 7^1\times {\mathrm{13}}^1\times {\mathrm{127}}^1\times {\mathrm{197}}^1$

素因数の和:350

約数の個数: 48

約数和(自身を含む): 36900864

約数和(自身を除く): 16410303

約数列:

[1, 3, 7, 9, 13, 21, 39, 63, 91, 117, 127, 197, 273, 381, 591, 819, 889, 1143, 1379, 1651, 1773, 2561, 2667, 4137, 4953, 7683, 8001, 11557, 12411, 14859, 17927, 23049, 25019, 34671, 53781, 75057, 104013, 161343, 175133, 225171, 325247, 525399, 975741, 1576197, 2276729, 2927223, 6830187, 20490561]

約数ペア:

[(1, 20490561), (3, 6830187), (7, 2927223), (9, 2276729), (13, 1576197), (21, 975741), (39, 525399), (63, 325247), (91, 225171), (117, 175133), (127, 161343), (197, 104013), (273, 75057), (381, 53781), (591, 34671), (819, 25019), (889, 23049), (1143, 17927), (1379, 14859), (1651, 12411), (1773, 11557), (2561, 8001), (2667, 7683), (4137, 4953)]