28165000

素因数分解:

$2^3\times 5^4\times {\mathrm{43}}^1\times {\mathrm{131}}^1$

素因数の和:200

約数の個数: 80

約数和(自身を含む): 68040720

約数和(自身を除く): 39875720

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 43, 50, 86, 100, 125, 131, 172, 200, 215, 250, 262, 344, 430, 500, 524, 625, 655, 860, 1000, 1048, 1075, 1250, 1310, 1720, 2150, 2500, 2620, 3275, 4300, 5000, 5240, 5375, 5633, 6550, 8600, 10750, 11266, 13100, 16375, 21500, 22532, 26200, 26875, 28165, 32750, 43000, 45064, 53750, 56330, 65500, 81875, 107500, 112660, 131000, 140825, 163750, 215000, 225320, 281650, 327500, 563300, 655000, 704125, 1126600, 1408250, 2816500, 3520625, 5633000, 7041250, 14082500, 28165000]

約数ペア:

[(1, 28165000), (2, 14082500), (4, 7041250), (5, 5633000), (8, 3520625), (10, 2816500), (20, 1408250), (25, 1126600), (40, 704125), (43, 655000), (50, 563300), (86, 327500), (100, 281650), (125, 225320), (131, 215000), (172, 163750), (200, 140825), (215, 131000), (250, 112660), (262, 107500), (344, 81875), (430, 65500), (500, 56330), (524, 53750), (625, 45064), (655, 43000), (860, 32750), (1000, 28165), (1048, 26875), (1075, 26200), (1250, 22532), (1310, 21500), (1720, 16375), (2150, 13100), (2500, 11266), (2620, 10750), (3275, 8600), (4300, 6550), (5000, 5633), (5240, 5375)]