21381255

素因数分解:

$3^2\times 5^1\times 7^1\times {\mathrm{103}}^1\times {\mathrm{659}}^1$

素因数の和:780

約数の個数: 48

約数和(自身を含む): 42831360

約数和(自身を除く): 21450105

約数列:

[1, 3, 5, 7, 9, 15, 21, 35, 45, 63, 103, 105, 309, 315, 515, 659, 721, 927, 1545, 1977, 2163, 3295, 3605, 4613, 4635, 5931, 6489, 9885, 10815, 13839, 23065, 29655, 32445, 41517, 67877, 69195, 203631, 207585, 339385, 475139, 610893, 1018155, 1425417, 2375695, 3054465, 4276251, 7127085, 21381255]

約数ペア:

[(1, 21381255), (3, 7127085), (5, 4276251), (7, 3054465), (9, 2375695), (15, 1425417), (21, 1018155), (35, 610893), (45, 475139), (63, 339385), (103, 207585), (105, 203631), (309, 69195), (315, 67877), (515, 41517), (659, 32445), (721, 29655), (927, 23065), (1545, 13839), (1977, 10815), (2163, 9885), (3295, 6489), (3605, 5931), (4613, 4635)]