20109100

素因数分解:

$2^2\times 5^2\times {\mathrm{11}}^1\times {\mathrm{101}}^1\times {\mathrm{181}}^1$

素因数の和:307

約数の個数: 72

約数和(自身を含む): 48340656

約数和(自身を除く): 28231556

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 25, 44, 50, 55, 100, 101, 110, 181, 202, 220, 275, 362, 404, 505, 550, 724, 905, 1010, 1100, 1111, 1810, 1991, 2020, 2222, 2525, 3620, 3982, 4444, 4525, 5050, 5555, 7964, 9050, 9955, 10100, 11110, 18100, 18281, 19910, 22220, 27775, 36562, 39820, 49775, 55550, 73124, 91405, 99550, 111100, 182810, 199100, 201091, 365620, 402182, 457025, 804364, 914050, 1005455, 1828100, 2010910, 4021820, 5027275, 10054550, 20109100]

約数ペア:

[(1, 20109100), (2, 10054550), (4, 5027275), (5, 4021820), (10, 2010910), (11, 1828100), (20, 1005455), (22, 914050), (25, 804364), (44, 457025), (50, 402182), (55, 365620), (100, 201091), (101, 199100), (110, 182810), (181, 111100), (202, 99550), (220, 91405), (275, 73124), (362, 55550), (404, 49775), (505, 39820), (550, 36562), (724, 27775), (905, 22220), (1010, 19910), (1100, 18281), (1111, 18100), (1810, 11110), (1991, 10100), (2020, 9955), (2222, 9050), (2525, 7964), (3620, 5555), (3982, 5050), (4444, 4525)]