20996920

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{41}}^1\times {\mathrm{59}}^1$

素因数の和:149

約数の個数: 128

約数和(自身を含む): 58060800

約数和(自身を除く): 37063880

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 31, 35, 40, 41, 56, 59, 62, 70, 82, 118, 124, 140, 155, 164, 205, 217, 236, 248, 280, 287, 295, 310, 328, 410, 413, 434, 472, 574, 590, 620, 820, 826, 868, 1085, 1148, 1180, 1240, 1271, 1435, 1640, 1652, 1736, 1829, 2065, 2170, 2296, 2360, 2419, 2542, 2870, 3304, 3658, 4130, 4340, 4838, 5084, 5740, 6355, 7316, 8260, 8680, 8897, 9145, 9676, 10168, 11480, 12095, 12710, 12803, 14632, 16520, 16933, 17794, 18290, 19352, 24190, 25420, 25606, 33866, 35588, 36580, 44485, 48380, 50840, 51212, 64015, 67732, 71176, 73160, 74989, 84665, 88970, 96760, 102424, 128030, 135464, 149978, 169330, 177940, 256060, 299956, 338660, 355880, 374945, 512120, 524923, 599912, 677320, 749890, 1049846, 1499780, 2099692, 2624615, 2999560, 4199384, 5249230, 10498460, 20996920]

約数ペア:

[(1, 20996920), (2, 10498460), (4, 5249230), (5, 4199384), (7, 2999560), (8, 2624615), (10, 2099692), (14, 1499780), (20, 1049846), (28, 749890), (31, 677320), (35, 599912), (40, 524923), (41, 512120), (56, 374945), (59, 355880), (62, 338660), (70, 299956), (82, 256060), (118, 177940), (124, 169330), (140, 149978), (155, 135464), (164, 128030), (205, 102424), (217, 96760), (236, 88970), (248, 84665), (280, 74989), (287, 73160), (295, 71176), (310, 67732), (328, 64015), (410, 51212), (413, 50840), (434, 48380), (472, 44485), (574, 36580), (590, 35588), (620, 33866), (820, 25606), (826, 25420), (868, 24190), (1085, 19352), (1148, 18290), (1180, 17794), (1240, 16933), (1271, 16520), (1435, 14632), (1640, 12803), (1652, 12710), (1736, 12095), (1829, 11480), (2065, 10168), (2170, 9676), (2296, 9145), (2360, 8897), (2419, 8680), (2542, 8260), (2870, 7316), (3304, 6355), (3658, 5740), (4130, 5084), (4340, 4838)]