21165680

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{79}}^1\times {\mathrm{197}}^1$

素因数の和:306

約数の個数: 80

約数和(自身を含む): 53032320

約数和(自身を除く): 31866640

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 34, 40, 68, 79, 80, 85, 136, 158, 170, 197, 272, 316, 340, 394, 395, 632, 680, 788, 790, 985, 1264, 1343, 1360, 1576, 1580, 1970, 2686, 3152, 3160, 3349, 3940, 5372, 6320, 6698, 6715, 7880, 10744, 13396, 13430, 15563, 15760, 16745, 21488, 26792, 26860, 31126, 33490, 53584, 53720, 62252, 66980, 77815, 107440, 124504, 133960, 155630, 249008, 264571, 267920, 311260, 529142, 622520, 1058284, 1245040, 1322855, 2116568, 2645710, 4233136, 5291420, 10582840, 21165680]

約数ペア:

[(1, 21165680), (2, 10582840), (4, 5291420), (5, 4233136), (8, 2645710), (10, 2116568), (16, 1322855), (17, 1245040), (20, 1058284), (34, 622520), (40, 529142), (68, 311260), (79, 267920), (80, 264571), (85, 249008), (136, 155630), (158, 133960), (170, 124504), (197, 107440), (272, 77815), (316, 66980), (340, 62252), (394, 53720), (395, 53584), (632, 33490), (680, 31126), (788, 26860), (790, 26792), (985, 21488), (1264, 16745), (1343, 15760), (1360, 15563), (1576, 13430), (1580, 13396), (1970, 10744), (2686, 7880), (3152, 6715), (3160, 6698), (3349, 6320), (3940, 5372)]