19806380

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{197}}^1\times {\mathrm{457}}^1$

素因数の和:674

約数の個数: 48

約数和(自身を含む): 45704736

約数和(自身を除く): 25898356

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 197, 220, 394, 457, 788, 914, 985, 1828, 1970, 2167, 2285, 3940, 4334, 4570, 5027, 8668, 9140, 10054, 10835, 20108, 21670, 25135, 43340, 50270, 90029, 100540, 180058, 360116, 450145, 900290, 990319, 1800580, 1980638, 3961276, 4951595, 9903190, 19806380]

約数ペア:

[(1, 19806380), (2, 9903190), (4, 4951595), (5, 3961276), (10, 1980638), (11, 1800580), (20, 990319), (22, 900290), (44, 450145), (55, 360116), (110, 180058), (197, 100540), (220, 90029), (394, 50270), (457, 43340), (788, 25135), (914, 21670), (985, 20108), (1828, 10835), (1970, 10054), (2167, 9140), (2285, 8668), (3940, 5027), (4334, 4570)]