21091815

素因数分解:

$3^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{79}}^1\times {\mathrm{349}}^1$

素因数の和:456

約数の個数: 48

約数和(自身を含む): 39312000

約数和(自身を除く): 18220185

約数列:

[1, 3, 5, 9, 15, 17, 45, 51, 79, 85, 153, 237, 255, 349, 395, 711, 765, 1047, 1185, 1343, 1745, 3141, 3555, 4029, 5235, 5933, 6715, 12087, 15705, 17799, 20145, 27571, 29665, 53397, 60435, 82713, 88995, 137855, 248139, 266985, 413565, 468707, 1240695, 1406121, 2343535, 4218363, 7030605, 21091815]

約数ペア:

[(1, 21091815), (3, 7030605), (5, 4218363), (9, 2343535), (15, 1406121), (17, 1240695), (45, 468707), (51, 413565), (79, 266985), (85, 248139), (153, 137855), (237, 88995), (255, 82713), (349, 60435), (395, 53397), (711, 29665), (765, 27571), (1047, 20145), (1185, 17799), (1343, 15705), (1745, 12087), (3141, 6715), (3555, 5933), (4029, 5235)]