21904871720

素因数分解:

$2^3\times 5^1\times {\mathrm{37}}^1\times {\mathrm{71}}^1\times {\mathrm{208459}}^1$

素因数の和:208578

約数の個数: 64

約数和(自身を含む): 51331190400

約数和(自身を除く): 29426318680

約数列:

[1, 2, 4, 5, 8, 10, 20, 37, 40, 71, 74, 142, 148, 185, 284, 296, 355, 370, 568, 710, 740, 1420, 1480, 2627, 2840, 5254, 10508, 13135, 21016, 26270, 52540, 105080, 208459, 416918, 833836, 1042295, 1667672, 2084590, 4169180, 7712983, 8338360, 14800589, 15425966, 29601178, 30851932, 38564915, 59202356, 61703864, 74002945, 77129830, 118404712, 148005890, 154259660, 296011780, 308519320, 547621793, 592023560, 1095243586, 2190487172, 2738108965, 4380974344, 5476217930, 10952435860, 21904871720]

約数ペア:

[(1, 21904871720), (2, 10952435860), (4, 5476217930), (5, 4380974344), (8, 2738108965), (10, 2190487172), (20, 1095243586), (37, 592023560), (40, 547621793), (71, 308519320), (74, 296011780), (142, 154259660), (148, 148005890), (185, 118404712), (284, 77129830), (296, 74002945), (355, 61703864), (370, 59202356), (568, 38564915), (710, 30851932), (740, 29601178), (1420, 15425966), (1480, 14800589), (2627, 8338360), (2840, 7712983), (5254, 4169180), (10508, 2084590), (13135, 1667672), (21016, 1042295), (26270, 833836), (52540, 416918), (105080, 208459)]