21003565

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{43}}^1\times {\mathrm{83}}^1\times {\mathrm{107}}^1$

素因数の和:249

約数の個数: 32

約数和(自身を含む): 28740096

約数和(自身を除く): 7736531

約数列:

[1, 5, 11, 43, 55, 83, 107, 215, 415, 473, 535, 913, 1177, 2365, 3569, 4565, 4601, 5885, 8881, 17845, 23005, 39259, 44405, 50611, 97691, 196295, 253055, 381883, 488455, 1909415, 4200713, 21003565]

約数ペア:

[(1, 21003565), (5, 4200713), (11, 1909415), (43, 488455), (55, 381883), (83, 253055), (107, 196295), (215, 97691), (415, 50611), (473, 44405), (535, 39259), (913, 23005), (1177, 17845), (2365, 8881), (3569, 5885), (4565, 4601)]