20156720

素因数分解:

$2^4\times 5^1\times {\mathrm{19}}^1\times {\mathrm{89}}^1\times {\mathrm{149}}^1$

素因数の和:270

約数の個数: 80

約数和(自身を含む): 50220000

約数和(自身を除く): 30063280

約数列:

[1, 2, 4, 5, 8, 10, 16, 19, 20, 38, 40, 76, 80, 89, 95, 149, 152, 178, 190, 298, 304, 356, 380, 445, 596, 712, 745, 760, 890, 1192, 1424, 1490, 1520, 1691, 1780, 2384, 2831, 2980, 3382, 3560, 5662, 5960, 6764, 7120, 8455, 11324, 11920, 13261, 13528, 14155, 16910, 22648, 26522, 27056, 28310, 33820, 45296, 53044, 56620, 66305, 67640, 106088, 113240, 132610, 135280, 212176, 226480, 251959, 265220, 503918, 530440, 1007836, 1060880, 1259795, 2015672, 2519590, 4031344, 5039180, 10078360, 20156720]

約数ペア:

[(1, 20156720), (2, 10078360), (4, 5039180), (5, 4031344), (8, 2519590), (10, 2015672), (16, 1259795), (19, 1060880), (20, 1007836), (38, 530440), (40, 503918), (76, 265220), (80, 251959), (89, 226480), (95, 212176), (149, 135280), (152, 132610), (178, 113240), (190, 106088), (298, 67640), (304, 66305), (356, 56620), (380, 53044), (445, 45296), (596, 33820), (712, 28310), (745, 27056), (760, 26522), (890, 22648), (1192, 16910), (1424, 14155), (1490, 13528), (1520, 13261), (1691, 11920), (1780, 11324), (2384, 8455), (2831, 7120), (2980, 6764), (3382, 5960), (3560, 5662)]