18679540

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{197}}^1\times {\mathrm{431}}^1$

素因数の和:648

約数の個数: 48

約数和(自身を含む): 43110144

約数和(自身を除く): 24430604

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 197, 220, 394, 431, 788, 862, 985, 1724, 1970, 2155, 2167, 3940, 4310, 4334, 4741, 8620, 8668, 9482, 10835, 18964, 21670, 23705, 43340, 47410, 84907, 94820, 169814, 339628, 424535, 849070, 933977, 1698140, 1867954, 3735908, 4669885, 9339770, 18679540]

約数ペア:

[(1, 18679540), (2, 9339770), (4, 4669885), (5, 3735908), (10, 1867954), (11, 1698140), (20, 933977), (22, 849070), (44, 424535), (55, 339628), (110, 169814), (197, 94820), (220, 84907), (394, 47410), (431, 43340), (788, 23705), (862, 21670), (985, 18964), (1724, 10835), (1970, 9482), (2155, 8668), (2167, 8620), (3940, 4741), (4310, 4334)]