21125260

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{2621}}^1$

素因数の和:2674

約数の個数: 48

約数和(自身を含む): 49335552

約数和(自身を除く): 28210292

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 31, 52, 62, 65, 124, 130, 155, 260, 310, 403, 620, 806, 1612, 2015, 2621, 4030, 5242, 8060, 10484, 13105, 26210, 34073, 52420, 68146, 81251, 136292, 162502, 170365, 325004, 340730, 406255, 681460, 812510, 1056263, 1625020, 2112526, 4225052, 5281315, 10562630, 21125260]

約数ペア:

[(1, 21125260), (2, 10562630), (4, 5281315), (5, 4225052), (10, 2112526), (13, 1625020), (20, 1056263), (26, 812510), (31, 681460), (52, 406255), (62, 340730), (65, 325004), (124, 170365), (130, 162502), (155, 136292), (260, 81251), (310, 68146), (403, 52420), (620, 34073), (806, 26210), (1612, 13105), (2015, 10484), (2621, 8060), (4030, 5242)]