21219825

素因数分解:

$3^1\times 5^2\times {\mathrm{11}}^1\times {\mathrm{17}}^2\times {\mathrm{89}}^1$

素因数の和:147

約数の個数: 72

約数和(自身を含む): 41113440

約数和(自身を除く): 19893615

約数列:

[1, 3, 5, 11, 15, 17, 25, 33, 51, 55, 75, 85, 89, 165, 187, 255, 267, 275, 289, 425, 445, 561, 825, 867, 935, 979, 1275, 1335, 1445, 1513, 2225, 2805, 2937, 3179, 4335, 4539, 4675, 4895, 6675, 7225, 7565, 9537, 14025, 14685, 15895, 16643, 21675, 22695, 24475, 25721, 37825, 47685, 49929, 73425, 77163, 79475, 83215, 113475, 128605, 238425, 249645, 282931, 385815, 416075, 643025, 848793, 1248225, 1414655, 1929075, 4243965, 7073275, 21219825]

約数ペア:

[(1, 21219825), (3, 7073275), (5, 4243965), (11, 1929075), (15, 1414655), (17, 1248225), (25, 848793), (33, 643025), (51, 416075), (55, 385815), (75, 282931), (85, 249645), (89, 238425), (165, 128605), (187, 113475), (255, 83215), (267, 79475), (275, 77163), (289, 73425), (425, 49929), (445, 47685), (561, 37825), (825, 25721), (867, 24475), (935, 22695), (979, 21675), (1275, 16643), (1335, 15895), (1445, 14685), (1513, 14025), (2225, 9537), (2805, 7565), (2937, 7225), (3179, 6675), (4335, 4895), (4539, 4675)]