20520940

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{37}}^1\times {\mathrm{2521}}^1$

素因数の和:2578

約数の個数: 48

約数和(自身を含む): 48301344

約数和(自身を除く): 27780404

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 37, 44, 55, 74, 110, 148, 185, 220, 370, 407, 740, 814, 1628, 2035, 2521, 4070, 5042, 8140, 10084, 12605, 25210, 27731, 50420, 55462, 93277, 110924, 138655, 186554, 277310, 373108, 466385, 554620, 932770, 1026047, 1865540, 2052094, 4104188, 5130235, 10260470, 20520940]

約数ペア:

[(1, 20520940), (2, 10260470), (4, 5130235), (5, 4104188), (10, 2052094), (11, 1865540), (20, 1026047), (22, 932770), (37, 554620), (44, 466385), (55, 373108), (74, 277310), (110, 186554), (148, 138655), (185, 110924), (220, 93277), (370, 55462), (407, 50420), (740, 27731), (814, 25210), (1628, 12605), (2035, 10084), (2521, 8140), (4070, 5042)]