21745280

素因数分解:

$2^7\times 5^1\times {\mathrm{61}}^1\times {\mathrm{557}}^1$

素因数の和:637

約数の個数: 64

約数和(自身を含む): 52931880

約数和(自身を除く): 31186600

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 61, 64, 80, 122, 128, 160, 244, 305, 320, 488, 557, 610, 640, 976, 1114, 1220, 1952, 2228, 2440, 2785, 3904, 4456, 4880, 5570, 7808, 8912, 9760, 11140, 17824, 19520, 22280, 33977, 35648, 39040, 44560, 67954, 71296, 89120, 135908, 169885, 178240, 271816, 339770, 356480, 543632, 679540, 1087264, 1359080, 2174528, 2718160, 4349056, 5436320, 10872640, 21745280]

約数ペア:

[(1, 21745280), (2, 10872640), (4, 5436320), (5, 4349056), (8, 2718160), (10, 2174528), (16, 1359080), (20, 1087264), (32, 679540), (40, 543632), (61, 356480), (64, 339770), (80, 271816), (122, 178240), (128, 169885), (160, 135908), (244, 89120), (305, 71296), (320, 67954), (488, 44560), (557, 39040), (610, 35648), (640, 33977), (976, 22280), (1114, 19520), (1220, 17824), (1952, 11140), (2228, 9760), (2440, 8912), (2785, 7808), (3904, 5570), (4456, 4880)]