20997964

素因数分解:

$2^2\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{53}}^1\times {\mathrm{401}}^1$

素因数の和:490

約数の個数: 48

約数和(自身を含む): 42547680

約数和(自身を除く): 21549716

約数列:

[1, 2, 4, 13, 19, 26, 38, 52, 53, 76, 106, 212, 247, 401, 494, 689, 802, 988, 1007, 1378, 1604, 2014, 2756, 4028, 5213, 7619, 10426, 13091, 15238, 20852, 21253, 26182, 30476, 42506, 52364, 85012, 99047, 198094, 276289, 396188, 403807, 552578, 807614, 1105156, 1615228, 5249491, 10498982, 20997964]

約数ペア:

[(1, 20997964), (2, 10498982), (4, 5249491), (13, 1615228), (19, 1105156), (26, 807614), (38, 552578), (52, 403807), (53, 396188), (76, 276289), (106, 198094), (212, 99047), (247, 85012), (401, 52364), (494, 42506), (689, 30476), (802, 26182), (988, 21253), (1007, 20852), (1378, 15238), (1604, 13091), (2014, 10426), (2756, 7619), (4028, 5213)]