18127940

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{107}}^1\times {\mathrm{197}}^1$

素因数の和:356

約数の個数: 48

約数和(自身を含む): 39517632

約数和(自身を除く): 21389692

約数列:

[1, 2, 4, 5, 10, 20, 43, 86, 107, 172, 197, 214, 215, 394, 428, 430, 535, 788, 860, 985, 1070, 1970, 2140, 3940, 4601, 8471, 9202, 16942, 18404, 21079, 23005, 33884, 42158, 42355, 46010, 84316, 84710, 92020, 105395, 169420, 210790, 421580, 906397, 1812794, 3625588, 4531985, 9063970, 18127940]

約数ペア:

[(1, 18127940), (2, 9063970), (4, 4531985), (5, 3625588), (10, 1812794), (20, 906397), (43, 421580), (86, 210790), (107, 169420), (172, 105395), (197, 92020), (214, 84710), (215, 84316), (394, 46010), (428, 42355), (430, 42158), (535, 33884), (788, 23005), (860, 21079), (985, 18404), (1070, 16942), (1970, 9202), (2140, 8471), (3940, 4601)]