640380

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{821}}^1$

素因数の和:846

約数の個数: 48

約数和(自身を含む): 1933344

約数和(自身を除く): 1292964

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, 821, 1642, 2463, 3284, 4105, 4926, 8210, 9852, 10673, 12315, 16420, 21346, 24630, 32019, 42692, 49260, 53365, 64038, 106730, 128076, 160095, 213460, 320190, 640380]

約数ペア:

[(1, 640380), (2, 320190), (3, 213460), (4, 160095), (5, 128076), (6, 106730), (10, 64038), (12, 53365), (13, 49260), (15, 42692), (20, 32019), (26, 24630), (30, 21346), (39, 16420), (52, 12315), (60, 10673), (65, 9852), (78, 8210), (130, 4926), (156, 4105), (195, 3284), (260, 2463), (390, 1642), (780, 821)]