21031720

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{157}}^1\times {\mathrm{197}}^1$

素因数の和:382

約数の個数: 64

約数和(自身を含む): 50680080

約数和(自身を除く): 29648360

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 136, 157, 170, 197, 314, 340, 394, 628, 680, 785, 788, 985, 1256, 1570, 1576, 1970, 2669, 3140, 3349, 3940, 5338, 6280, 6698, 7880, 10676, 13345, 13396, 16745, 21352, 26690, 26792, 30929, 33490, 53380, 61858, 66980, 106760, 123716, 133960, 154645, 247432, 309290, 525793, 618580, 1051586, 1237160, 2103172, 2628965, 4206344, 5257930, 10515860, 21031720]

約数ペア:

[(1, 21031720), (2, 10515860), (4, 5257930), (5, 4206344), (8, 2628965), (10, 2103172), (17, 1237160), (20, 1051586), (34, 618580), (40, 525793), (68, 309290), (85, 247432), (136, 154645), (157, 133960), (170, 123716), (197, 106760), (314, 66980), (340, 61858), (394, 53380), (628, 33490), (680, 30929), (785, 26792), (788, 26690), (985, 21352), (1256, 16745), (1570, 13396), (1576, 13345), (1970, 10676), (2669, 7880), (3140, 6698), (3349, 6280), (3940, 5338)]