21487280

素因数分解:

$2^4\times 5^1\times {\mathrm{41}}^1\times {\mathrm{6551}}^1$

素因数の和:6605

約数の個数: 40

約数和(自身を含む): 51184224

約数和(自身を除く): 29696944

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 41, 80, 82, 164, 205, 328, 410, 656, 820, 1640, 3280, 6551, 13102, 26204, 32755, 52408, 65510, 104816, 131020, 262040, 268591, 524080, 537182, 1074364, 1342955, 2148728, 2685910, 4297456, 5371820, 10743640, 21487280]

約数ペア:

[(1, 21487280), (2, 10743640), (4, 5371820), (5, 4297456), (8, 2685910), (10, 2148728), (16, 1342955), (20, 1074364), (40, 537182), (41, 524080), (80, 268591), (82, 262040), (164, 131020), (205, 104816), (328, 65510), (410, 52408), (656, 32755), (820, 26204), (1640, 13102), (3280, 6551)]