21290815

素因数分解:

$5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{73}}^1\times {\mathrm{641}}^1$

素因数の和:739

約数の個数: 32

約数和(自身を含む): 31925376

約数和(自身を除く): 10634561

約数列:

[1, 5, 7, 13, 35, 65, 73, 91, 365, 455, 511, 641, 949, 2555, 3205, 4487, 4745, 6643, 8333, 22435, 33215, 41665, 46793, 58331, 233965, 291655, 327551, 608309, 1637755, 3041545, 4258163, 21290815]

約数ペア:

[(1, 21290815), (5, 4258163), (7, 3041545), (13, 1637755), (35, 608309), (65, 327551), (73, 291655), (91, 233965), (365, 58331), (455, 46793), (511, 41665), (641, 33215), (949, 22435), (2555, 8333), (3205, 6643), (4487, 4745)]