19801980

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{73}}^1\times {\mathrm{137}}^1$

素因数の和:236

約数の個数: 144

約数和(自身を含む): 66909024

約数和(自身を除く): 47107044

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 11, 12, 15, 18, 20, 22, 30, 33, 36, 44, 45, 55, 60, 66, 73, 90, 99, 110, 132, 137, 146, 165, 180, 198, 219, 220, 274, 292, 330, 365, 396, 411, 438, 495, 548, 657, 660, 685, 730, 803, 822, 876, 990, 1095, 1233, 1314, 1370, 1460, 1507, 1606, 1644, 1980, 2055, 2190, 2409, 2466, 2628, 2740, 3014, 3212, 3285, 4015, 4110, 4380, 4521, 4818, 4932, 6028, 6165, 6570, 7227, 7535, 8030, 8220, 9042, 9636, 10001, 12045, 12330, 13140, 13563, 14454, 15070, 16060, 18084, 20002, 22605, 24090, 24660, 27126, 28908, 30003, 30140, 36135, 40004, 45210, 48180, 50005, 54252, 60006, 67815, 72270, 90009, 90420, 100010, 110011, 120012, 135630, 144540, 150015, 180018, 200020, 220022, 271260, 300030, 330033, 360036, 440044, 450045, 550055, 600060, 660066, 900090, 990099, 1100110, 1320132, 1650165, 1800180, 1980198, 2200220, 3300330, 3960396, 4950495, 6600660, 9900990, 19801980]

約数ペア:

[(1, 19801980), (2, 9900990), (3, 6600660), (4, 4950495), (5, 3960396), (6, 3300330), (9, 2200220), (10, 1980198), (11, 1800180), (12, 1650165), (15, 1320132), (18, 1100110), (20, 990099), (22, 900090), (30, 660066), (33, 600060), (36, 550055), (44, 450045), (45, 440044), (55, 360036), (60, 330033), (66, 300030), (73, 271260), (90, 220022), (99, 200020), (110, 180018), (132, 150015), (137, 144540), (146, 135630), (165, 120012), (180, 110011), (198, 100010), (219, 90420), (220, 90009), (274, 72270), (292, 67815), (330, 60006), (365, 54252), (396, 50005), (411, 48180), (438, 45210), (495, 40004), (548, 36135), (657, 30140), (660, 30003), (685, 28908), (730, 27126), (803, 24660), (822, 24090), (876, 22605), (990, 20002), (1095, 18084), (1233, 16060), (1314, 15070), (1370, 14454), (1460, 13563), (1507, 13140), (1606, 12330), (1644, 12045), (1980, 10001), (2055, 9636), (2190, 9042), (2409, 8220), (2466, 8030), (2628, 7535), (2740, 7227), (3014, 6570), (3212, 6165), (3285, 6028), (4015, 4932), (4110, 4818), (4380, 4521)]