81907371

素因数分解:

$3^2\times 7^3\times {\mathrm{13}}^2\times {\mathrm{157}}^1$

素因数の和:210

約数の個数: 72

約数和(自身を含む): 150352800

約数和(自身を除く): 68445429

約数列:

[1, 3, 7, 9, 13, 21, 39, 49, 63, 91, 117, 147, 157, 169, 273, 343, 441, 471, 507, 637, 819, 1029, 1099, 1183, 1413, 1521, 1911, 2041, 3087, 3297, 3549, 4459, 5733, 6123, 7693, 8281, 9891, 10647, 13377, 14287, 18369, 23079, 24843, 26533, 40131, 42861, 53851, 57967, 69237, 74529, 79599, 100009, 128583, 161553, 173901, 185731, 238797, 300027, 484659, 521703, 557193, 700063, 900081, 1300117, 1671579, 2100189, 3900351, 6300567, 9100819, 11701053, 27302457, 81907371]

約数ペア:

[(1, 81907371), (3, 27302457), (7, 11701053), (9, 9100819), (13, 6300567), (21, 3900351), (39, 2100189), (49, 1671579), (63, 1300117), (91, 900081), (117, 700063), (147, 557193), (157, 521703), (169, 484659), (273, 300027), (343, 238797), (441, 185731), (471, 173901), (507, 161553), (637, 128583), (819, 100009), (1029, 79599), (1099, 74529), (1183, 69237), (1413, 57967), (1521, 53851), (1911, 42861), (2041, 40131), (3087, 26533), (3297, 24843), (3549, 23079), (4459, 18369), (5733, 14287), (6123, 13377), (7693, 10647), (8281, 9891)]