221121215

素因数分解:

$5^1\times 7^1\times {\mathrm{109}}^1\times {\mathrm{149}}^1\times {\mathrm{389}}^1$

素因数の和:659

約数の個数: 32

約数和(自身を含む): 308880000

約数和(自身を除く): 87758785

約数列:

[1, 5, 7, 35, 109, 149, 389, 545, 745, 763, 1043, 1945, 2723, 3815, 5215, 13615, 16241, 42401, 57961, 81205, 113687, 212005, 289805, 296807, 405727, 568435, 1484035, 2028635, 6317749, 31588745, 44224243, 221121215]

約数ペア:

[(1, 221121215), (5, 44224243), (7, 31588745), (35, 6317749), (109, 2028635), (149, 1484035), (389, 568435), (545, 405727), (745, 296807), (763, 289805), (1043, 212005), (1945, 113687), (2723, 81205), (3815, 57961), (5215, 42401), (13615, 16241)]