20608240

素因数分解:

$2^4\times 5^1\times {\mathrm{41}}^1\times {\mathrm{61}}^1\times {\mathrm{103}}^1$

素因数の和:218

約数の個数: 80

約数和(自身を含む): 50371776

約数和(自身を除く): 29763536

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 41, 61, 80, 82, 103, 122, 164, 205, 206, 244, 305, 328, 410, 412, 488, 515, 610, 656, 820, 824, 976, 1030, 1220, 1640, 1648, 2060, 2440, 2501, 3280, 4120, 4223, 4880, 5002, 6283, 8240, 8446, 10004, 12505, 12566, 16892, 20008, 21115, 25010, 25132, 31415, 33784, 40016, 42230, 50020, 50264, 62830, 67568, 84460, 100040, 100528, 125660, 168920, 200080, 251320, 257603, 337840, 502640, 515206, 1030412, 1288015, 2060824, 2576030, 4121648, 5152060, 10304120, 20608240]

約数ペア:

[(1, 20608240), (2, 10304120), (4, 5152060), (5, 4121648), (8, 2576030), (10, 2060824), (16, 1288015), (20, 1030412), (40, 515206), (41, 502640), (61, 337840), (80, 257603), (82, 251320), (103, 200080), (122, 168920), (164, 125660), (205, 100528), (206, 100040), (244, 84460), (305, 67568), (328, 62830), (410, 50264), (412, 50020), (488, 42230), (515, 40016), (610, 33784), (656, 31415), (820, 25132), (824, 25010), (976, 21115), (1030, 20008), (1220, 16892), (1640, 12566), (1648, 12505), (2060, 10004), (2440, 8446), (2501, 8240), (3280, 6283), (4120, 5002), (4223, 4880)]