18991995

素因数分解:

$3^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{47}}^1\times {\mathrm{79}}^1$

素因数の和:176

約数の個数: 64

約数和(自身を含む): 35389440

約数和(自身を除く): 16397445

約数列:

[1, 3, 5, 11, 15, 31, 33, 47, 55, 79, 93, 141, 155, 165, 235, 237, 341, 395, 465, 517, 705, 869, 1023, 1185, 1457, 1551, 1705, 2449, 2585, 2607, 3713, 4345, 4371, 5115, 7285, 7347, 7755, 11139, 12245, 13035, 16027, 18565, 21855, 26939, 36735, 40843, 48081, 55695, 80135, 80817, 115103, 122529, 134695, 204215, 240405, 345309, 404085, 575515, 612645, 1266133, 1726545, 3798399, 6330665, 18991995]

約数ペア:

[(1, 18991995), (3, 6330665), (5, 3798399), (11, 1726545), (15, 1266133), (31, 612645), (33, 575515), (47, 404085), (55, 345309), (79, 240405), (93, 204215), (141, 134695), (155, 122529), (165, 115103), (235, 80817), (237, 80135), (341, 55695), (395, 48081), (465, 40843), (517, 36735), (705, 26939), (869, 21855), (1023, 18565), (1185, 16027), (1457, 13035), (1551, 12245), (1705, 11139), (2449, 7755), (2585, 7347), (2607, 7285), (3713, 5115), (4345, 4371)]