20818280

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{149}}^1\times {\mathrm{499}}^1$

素因数の和:666

約数の個数: 64

約数和(自身を含む): 54000000

約数和(自身を除く): 33181720

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 149, 280, 298, 499, 596, 745, 998, 1043, 1192, 1490, 1996, 2086, 2495, 2980, 3493, 3992, 4172, 4990, 5215, 5960, 6986, 8344, 9980, 10430, 13972, 17465, 19960, 20860, 27944, 34930, 41720, 69860, 74351, 139720, 148702, 297404, 371755, 520457, 594808, 743510, 1040914, 1487020, 2081828, 2602285, 2974040, 4163656, 5204570, 10409140, 20818280]

約数ペア:

[(1, 20818280), (2, 10409140), (4, 5204570), (5, 4163656), (7, 2974040), (8, 2602285), (10, 2081828), (14, 1487020), (20, 1040914), (28, 743510), (35, 594808), (40, 520457), (56, 371755), (70, 297404), (140, 148702), (149, 139720), (280, 74351), (298, 69860), (499, 41720), (596, 34930), (745, 27944), (998, 20860), (1043, 19960), (1192, 17465), (1490, 13972), (1996, 10430), (2086, 9980), (2495, 8344), (2980, 6986), (3493, 5960), (3992, 5215), (4172, 4990)]