28045000

素因数分解:

$2^3\times 5^4\times {\mathrm{71}}^1\times {\mathrm{79}}^1$

素因数の和:176

約数の個数: 80

約数和(自身を含む): 67478400

約数和(自身を除く): 39433400

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 71, 79, 100, 125, 142, 158, 200, 250, 284, 316, 355, 395, 500, 568, 625, 632, 710, 790, 1000, 1250, 1420, 1580, 1775, 1975, 2500, 2840, 3160, 3550, 3950, 5000, 5609, 7100, 7900, 8875, 9875, 11218, 14200, 15800, 17750, 19750, 22436, 28045, 35500, 39500, 44375, 44872, 49375, 56090, 71000, 79000, 88750, 98750, 112180, 140225, 177500, 197500, 224360, 280450, 355000, 395000, 560900, 701125, 1121800, 1402250, 2804500, 3505625, 5609000, 7011250, 14022500, 28045000]

約数ペア:

[(1, 28045000), (2, 14022500), (4, 7011250), (5, 5609000), (8, 3505625), (10, 2804500), (20, 1402250), (25, 1121800), (40, 701125), (50, 560900), (71, 395000), (79, 355000), (100, 280450), (125, 224360), (142, 197500), (158, 177500), (200, 140225), (250, 112180), (284, 98750), (316, 88750), (355, 79000), (395, 71000), (500, 56090), (568, 49375), (625, 44872), (632, 44375), (710, 39500), (790, 35500), (1000, 28045), (1250, 22436), (1420, 19750), (1580, 17750), (1775, 15800), (1975, 14200), (2500, 11218), (2840, 9875), (3160, 8875), (3550, 7900), (3950, 7100), (5000, 5609)]