18517720

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{149}}^1\times {\mathrm{239}}^1$

素因数の和:412

約数の個数: 64

約数和(自身を含む): 45360000

約数和(自身を除く): 26842280

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 149, 239, 260, 298, 478, 520, 596, 745, 956, 1192, 1195, 1490, 1912, 1937, 2390, 2980, 3107, 3874, 4780, 5960, 6214, 7748, 9560, 9685, 12428, 15496, 15535, 19370, 24856, 31070, 35611, 38740, 62140, 71222, 77480, 124280, 142444, 178055, 284888, 356110, 462943, 712220, 925886, 1424440, 1851772, 2314715, 3703544, 4629430, 9258860, 18517720]

約数ペア:

[(1, 18517720), (2, 9258860), (4, 4629430), (5, 3703544), (8, 2314715), (10, 1851772), (13, 1424440), (20, 925886), (26, 712220), (40, 462943), (52, 356110), (65, 284888), (104, 178055), (130, 142444), (149, 124280), (239, 77480), (260, 71222), (298, 62140), (478, 38740), (520, 35611), (596, 31070), (745, 24856), (956, 19370), (1192, 15535), (1195, 15496), (1490, 12428), (1912, 9685), (1937, 9560), (2390, 7748), (2980, 6214), (3107, 5960), (3874, 4780)]