21860735

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{571}}^1$

素因数の和:639

約数の個数: 32

約数和(自身を含む): 30750720

約数和(自身を除く): 8889985

約数列:

[1, 5, 13, 19, 31, 65, 95, 155, 247, 403, 571, 589, 1235, 2015, 2855, 2945, 7423, 7657, 10849, 17701, 37115, 38285, 54245, 88505, 141037, 230113, 336319, 705185, 1150565, 1681595, 4372147, 21860735]

約数ペア:

[(1, 21860735), (5, 4372147), (13, 1681595), (19, 1150565), (31, 705185), (65, 336319), (95, 230113), (155, 141037), (247, 88505), (403, 54245), (571, 38285), (589, 37115), (1235, 17701), (2015, 10849), (2855, 7657), (2945, 7423)]