21415120

素因数分解:

$2^4\times 5^1\times {\mathrm{41}}^1\times {\mathrm{6529}}^1$

素因数の和:6583

約数の個数: 40

約数和(自身を含む): 51012360

約数和(自身を除く): 29597240

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 41, 80, 82, 164, 205, 328, 410, 656, 820, 1640, 3280, 6529, 13058, 26116, 32645, 52232, 65290, 104464, 130580, 261160, 267689, 522320, 535378, 1070756, 1338445, 2141512, 2676890, 4283024, 5353780, 10707560, 21415120]

約数ペア:

[(1, 21415120), (2, 10707560), (4, 5353780), (5, 4283024), (8, 2676890), (10, 2141512), (16, 1338445), (20, 1070756), (40, 535378), (41, 522320), (80, 267689), (82, 261160), (164, 130580), (205, 104464), (328, 65290), (410, 52232), (656, 32645), (820, 26116), (1640, 13058), (3280, 6529)]