20278125

素因数分解:

$3^2\times 5^5\times 7^1\times {\mathrm{103}}^1$

素因数の和:141

約数の個数: 72

約数和(自身を含む): 42247296

約数和(自身を除く): 21969171

約数列:

[1, 3, 5, 7, 9, 15, 21, 25, 35, 45, 63, 75, 103, 105, 125, 175, 225, 309, 315, 375, 515, 525, 625, 721, 875, 927, 1125, 1545, 1575, 1875, 2163, 2575, 2625, 3125, 3605, 4375, 4635, 5625, 6489, 7725, 7875, 9375, 10815, 12875, 13125, 18025, 21875, 23175, 28125, 32445, 38625, 39375, 54075, 64375, 65625, 90125, 115875, 162225, 193125, 196875, 270375, 321875, 450625, 579375, 811125, 965625, 1351875, 2253125, 2896875, 4055625, 6759375, 20278125]

約数ペア:

[(1, 20278125), (3, 6759375), (5, 4055625), (7, 2896875), (9, 2253125), (15, 1351875), (21, 965625), (25, 811125), (35, 579375), (45, 450625), (63, 321875), (75, 270375), (103, 196875), (105, 193125), (125, 162225), (175, 115875), (225, 90125), (309, 65625), (315, 64375), (375, 54075), (515, 39375), (525, 38625), (625, 32445), (721, 28125), (875, 23175), (927, 21875), (1125, 18025), (1545, 13125), (1575, 12875), (1875, 10815), (2163, 9375), (2575, 7875), (2625, 7725), (3125, 6489), (3605, 5625), (4375, 4635)]