21505617

素因数分解:

$3^2\times 7^1\times {\mathrm{29}}^1\times {\mathrm{79}}^1\times {\mathrm{149}}^1$

素因数の和:270

約数の個数: 48

約数和(自身を含む): 37440000

約数和(自身を除く): 15934383

約数列:

[1, 3, 7, 9, 21, 29, 63, 79, 87, 149, 203, 237, 261, 447, 553, 609, 711, 1043, 1341, 1659, 1827, 2291, 3129, 4321, 4977, 6873, 9387, 11771, 12963, 16037, 20619, 30247, 35313, 38889, 48111, 82397, 90741, 105939, 144333, 247191, 272223, 341359, 741573, 1024077, 2389513, 3072231, 7168539, 21505617]

約数ペア:

[(1, 21505617), (3, 7168539), (7, 3072231), (9, 2389513), (21, 1024077), (29, 741573), (63, 341359), (79, 272223), (87, 247191), (149, 144333), (203, 105939), (237, 90741), (261, 82397), (447, 48111), (553, 38889), (609, 35313), (711, 30247), (1043, 20619), (1341, 16037), (1659, 12963), (1827, 11771), (2291, 9387), (3129, 6873), (4321, 4977)]