21078715

素因数分解:

$5^1\times 7^1\times {\mathrm{37}}^1\times {\mathrm{41}}^1\times {\mathrm{397}}^1$

素因数の和:487

約数の個数: 32

約数和(自身を含む): 30489984

約数和(自身を除く): 9411269

約数列:

[1, 5, 7, 35, 37, 41, 185, 205, 259, 287, 397, 1295, 1435, 1517, 1985, 2779, 7585, 10619, 13895, 14689, 16277, 53095, 73445, 81385, 102823, 113939, 514115, 569695, 602249, 3011245, 4215743, 21078715]

約数ペア:

[(1, 21078715), (5, 4215743), (7, 3011245), (35, 602249), (37, 569695), (41, 514115), (185, 113939), (205, 102823), (259, 81385), (287, 73445), (397, 53095), (1295, 16277), (1435, 14689), (1517, 13895), (1985, 10619), (2779, 7585)]