21019725

素因数分解:

$3^2\times 5^2\times {\mathrm{103}}^1\times {\mathrm{907}}^1$

素因数の和:1026

約数の個数: 36

約数和(自身を含む): 38056096

約数和(自身を除く): 17036371

約数列:

[1, 3, 5, 9, 15, 25, 45, 75, 103, 225, 309, 515, 907, 927, 1545, 2575, 2721, 4535, 4635, 7725, 8163, 13605, 22675, 23175, 40815, 68025, 93421, 204075, 280263, 467105, 840789, 1401315, 2335525, 4203945, 7006575, 21019725]

約数ペア:

[(1, 21019725), (3, 7006575), (5, 4203945), (9, 2335525), (15, 1401315), (25, 840789), (45, 467105), (75, 280263), (103, 204075), (225, 93421), (309, 68025), (515, 40815), (907, 23175), (927, 22675), (1545, 13605), (2575, 8163), (2721, 7725), (4535, 4635)]