21565700

素因数分解:

$2^2\times 5^2\times {\mathrm{13}}^1\times {\mathrm{53}}^1\times {\mathrm{313}}^1$

素因数の和:393

約数の個数: 72

約数和(自身を含む): 51512328

約数和(自身を除く): 29946628

約数列:

[1, 2, 4, 5, 10, 13, 20, 25, 26, 50, 52, 53, 65, 100, 106, 130, 212, 260, 265, 313, 325, 530, 626, 650, 689, 1060, 1252, 1300, 1325, 1378, 1565, 2650, 2756, 3130, 3445, 4069, 5300, 6260, 6890, 7825, 8138, 13780, 15650, 16276, 16589, 17225, 20345, 31300, 33178, 34450, 40690, 66356, 68900, 81380, 82945, 101725, 165890, 203450, 215657, 331780, 406900, 414725, 431314, 829450, 862628, 1078285, 1658900, 2156570, 4313140, 5391425, 10782850, 21565700]

約数ペア:

[(1, 21565700), (2, 10782850), (4, 5391425), (5, 4313140), (10, 2156570), (13, 1658900), (20, 1078285), (25, 862628), (26, 829450), (50, 431314), (52, 414725), (53, 406900), (65, 331780), (100, 215657), (106, 203450), (130, 165890), (212, 101725), (260, 82945), (265, 81380), (313, 68900), (325, 66356), (530, 40690), (626, 34450), (650, 33178), (689, 31300), (1060, 20345), (1252, 17225), (1300, 16589), (1325, 16276), (1378, 15650), (1565, 13780), (2650, 8138), (2756, 7825), (3130, 6890), (3445, 6260), (4069, 5300)]