20819280

素因数分解:

$2^4\times 3^1\times 5^1\times {\mathrm{223}}^1\times {\mathrm{389}}^1$

素因数の和:628

約数の個数: 80

約数和(自身を含む): 64995840

約数和(自身を除く): 44176560

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 40, 48, 60, 80, 120, 223, 240, 389, 446, 669, 778, 892, 1115, 1167, 1338, 1556, 1784, 1945, 2230, 2334, 2676, 3112, 3345, 3568, 3890, 4460, 4668, 5352, 5835, 6224, 6690, 7780, 8920, 9336, 10704, 11670, 13380, 15560, 17840, 18672, 23340, 26760, 31120, 46680, 53520, 86747, 93360, 173494, 260241, 346988, 433735, 520482, 693976, 867470, 1040964, 1301205, 1387952, 1734940, 2081928, 2602410, 3469880, 4163856, 5204820, 6939760, 10409640, 20819280]

約数ペア:

[(1, 20819280), (2, 10409640), (3, 6939760), (4, 5204820), (5, 4163856), (6, 3469880), (8, 2602410), (10, 2081928), (12, 1734940), (15, 1387952), (16, 1301205), (20, 1040964), (24, 867470), (30, 693976), (40, 520482), (48, 433735), (60, 346988), (80, 260241), (120, 173494), (223, 93360), (240, 86747), (389, 53520), (446, 46680), (669, 31120), (778, 26760), (892, 23340), (1115, 18672), (1167, 17840), (1338, 15560), (1556, 13380), (1784, 11670), (1945, 10704), (2230, 9336), (2334, 8920), (2676, 7780), (3112, 6690), (3345, 6224), (3568, 5835), (3890, 5352), (4460, 4668)]