19984380

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{25621}}^1$

素因数の和:25646

約数の個数: 48

約数和(自身を含む): 60262944

約数和(自身を除く): 40278564

約数列:

[1, 2, 3, 4, 5, 6, 10, 12, 13, 15, 20, 26, 30, 39, 52, 60, 65, 78, 130, 156, 195, 260, 390, 780, 25621, 51242, 76863, 102484, 128105, 153726, 256210, 307452, 333073, 384315, 512420, 666146, 768630, 999219, 1332292, 1537260, 1665365, 1998438, 3330730, 3996876, 4996095, 6661460, 9992190, 19984380]

約数ペア:

[(1, 19984380), (2, 9992190), (3, 6661460), (4, 4996095), (5, 3996876), (6, 3330730), (10, 1998438), (12, 1665365), (13, 1537260), (15, 1332292), (20, 999219), (26, 768630), (30, 666146), (39, 512420), (52, 384315), (60, 333073), (65, 307452), (78, 256210), (130, 153726), (156, 128105), (195, 102484), (260, 76863), (390, 51242), (780, 25621)]