21720816

素因数分解:

$2^4\times 3^2\times {\mathrm{13}}^1\times {\mathrm{41}}^1\times {\mathrm{283}}^1$

素因数の和:351

約数の個数: 120

約数和(自身を含む): 67297776

約数和(自身を除く): 45576960

約数列:

[1, 2, 3, 4, 6, 8, 9, 12, 13, 16, 18, 24, 26, 36, 39, 41, 48, 52, 72, 78, 82, 104, 117, 123, 144, 156, 164, 208, 234, 246, 283, 312, 328, 369, 468, 492, 533, 566, 624, 656, 738, 849, 936, 984, 1066, 1132, 1476, 1599, 1698, 1872, 1968, 2132, 2264, 2547, 2952, 3198, 3396, 3679, 4264, 4528, 4797, 5094, 5904, 6396, 6792, 7358, 8528, 9594, 10188, 11037, 11603, 12792, 13584, 14716, 19188, 20376, 22074, 23206, 25584, 29432, 33111, 34809, 38376, 40752, 44148, 46412, 58864, 66222, 69618, 76752, 88296, 92824, 104427, 132444, 139236, 150839, 176592, 185648, 208854, 264888, 278472, 301678, 417708, 452517, 529776, 556944, 603356, 835416, 905034, 1206712, 1357551, 1670832, 1810068, 2413424, 2715102, 3620136, 5430204, 7240272, 10860408, 21720816]

約数ペア:

[(1, 21720816), (2, 10860408), (3, 7240272), (4, 5430204), (6, 3620136), (8, 2715102), (9, 2413424), (12, 1810068), (13, 1670832), (16, 1357551), (18, 1206712), (24, 905034), (26, 835416), (36, 603356), (39, 556944), (41, 529776), (48, 452517), (52, 417708), (72, 301678), (78, 278472), (82, 264888), (104, 208854), (117, 185648), (123, 176592), (144, 150839), (156, 139236), (164, 132444), (208, 104427), (234, 92824), (246, 88296), (283, 76752), (312, 69618), (328, 66222), (369, 58864), (468, 46412), (492, 44148), (533, 40752), (566, 38376), (624, 34809), (656, 33111), (738, 29432), (849, 25584), (936, 23206), (984, 22074), (1066, 20376), (1132, 19188), (1476, 14716), (1599, 13584), (1698, 12792), (1872, 11603), (1968, 11037), (2132, 10188), (2264, 9594), (2547, 8528), (2952, 7358), (3198, 6792), (3396, 6396), (3679, 5904), (4264, 5094), (4528, 4797)]