21041560

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{71}}^1\times {\mathrm{239}}^1$

素因数の和:352

約数の個数: 64

約数和(自身を含む): 49766400

約数和(自身を除く): 28724840

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 71, 124, 142, 155, 239, 248, 284, 310, 355, 478, 568, 620, 710, 956, 1195, 1240, 1420, 1912, 2201, 2390, 2840, 4402, 4780, 7409, 8804, 9560, 11005, 14818, 16969, 17608, 22010, 29636, 33938, 37045, 44020, 59272, 67876, 74090, 84845, 88040, 135752, 148180, 169690, 296360, 339380, 526039, 678760, 1052078, 2104156, 2630195, 4208312, 5260390, 10520780, 21041560]

約数ペア:

[(1, 21041560), (2, 10520780), (4, 5260390), (5, 4208312), (8, 2630195), (10, 2104156), (20, 1052078), (31, 678760), (40, 526039), (62, 339380), (71, 296360), (124, 169690), (142, 148180), (155, 135752), (239, 88040), (248, 84845), (284, 74090), (310, 67876), (355, 59272), (478, 44020), (568, 37045), (620, 33938), (710, 29636), (956, 22010), (1195, 17608), (1240, 16969), (1420, 14818), (1912, 11005), (2201, 9560), (2390, 8804), (2840, 7409), (4402, 4780)]