21405915

素因数分解:

$3^2\times 5^1\times {\mathrm{29}}^1\times {\mathrm{47}}^1\times {\mathrm{349}}^1$

素因数の和:436

約数の個数: 48

約数和(自身を含む): 39312000

約数和(自身を除く): 17906085

約数列:

[1, 3, 5, 9, 15, 29, 45, 47, 87, 141, 145, 235, 261, 349, 423, 435, 705, 1047, 1305, 1363, 1745, 2115, 3141, 4089, 5235, 6815, 10121, 12267, 15705, 16403, 20445, 30363, 49209, 50605, 61335, 82015, 91089, 147627, 151815, 246045, 455445, 475687, 738135, 1427061, 2378435, 4281183, 7135305, 21405915]

約数ペア:

[(1, 21405915), (3, 7135305), (5, 4281183), (9, 2378435), (15, 1427061), (29, 738135), (45, 475687), (47, 455445), (87, 246045), (141, 151815), (145, 147627), (235, 91089), (261, 82015), (349, 61335), (423, 50605), (435, 49209), (705, 30363), (1047, 20445), (1305, 16403), (1363, 15705), (1745, 12267), (2115, 10121), (3141, 6815), (4089, 5235)]