20681545840

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{31}}^1\times {\mathrm{490549}}^1$

素因数の和:490610

約数の個数: 80

約数和(自身を含む): 52555564800

約数和(自身を除く): 31874018960

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 31, 34, 40, 62, 68, 80, 85, 124, 136, 155, 170, 248, 272, 310, 340, 496, 527, 620, 680, 1054, 1240, 1360, 2108, 2480, 2635, 4216, 5270, 8432, 10540, 21080, 42160, 490549, 981098, 1962196, 2452745, 3924392, 4905490, 7848784, 8339333, 9810980, 15207019, 16678666, 19621960, 30414038, 33357332, 39243920, 41696665, 60828076, 66714664, 76035095, 83393330, 121656152, 133429328, 152070190, 166786660, 243312304, 258519323, 304140380, 333573320, 517038646, 608280760, 667146640, 1034077292, 1216561520, 1292596615, 2068154584, 2585193230, 4136309168, 5170386460, 10340772920, 20681545840]

約数ペア:

[(1, 20681545840), (2, 10340772920), (4, 5170386460), (5, 4136309168), (8, 2585193230), (10, 2068154584), (16, 1292596615), (17, 1216561520), (20, 1034077292), (31, 667146640), (34, 608280760), (40, 517038646), (62, 333573320), (68, 304140380), (80, 258519323), (85, 243312304), (124, 166786660), (136, 152070190), (155, 133429328), (170, 121656152), (248, 83393330), (272, 76035095), (310, 66714664), (340, 60828076), (496, 41696665), (527, 39243920), (620, 33357332), (680, 30414038), (1054, 19621960), (1240, 16678666), (1360, 15207019), (2108, 9810980), (2480, 8339333), (2635, 7848784), (4216, 4905490), (5270, 3924392), (8432, 2452745), (10540, 1962196), (21080, 981098), (42160, 490549)]