21040760

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{941}}^1$

素因数の和:1008

約数の個数: 64

約数和(自身を含む): 52224480

約数和(自身を除く): 31183720

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 43, 52, 65, 86, 104, 130, 172, 215, 260, 344, 430, 520, 559, 860, 941, 1118, 1720, 1882, 2236, 2795, 3764, 4472, 4705, 5590, 7528, 9410, 11180, 12233, 18820, 22360, 24466, 37640, 40463, 48932, 61165, 80926, 97864, 122330, 161852, 202315, 244660, 323704, 404630, 489320, 526019, 809260, 1052038, 1618520, 2104076, 2630095, 4208152, 5260190, 10520380, 21040760]

約数ペア:

[(1, 21040760), (2, 10520380), (4, 5260190), (5, 4208152), (8, 2630095), (10, 2104076), (13, 1618520), (20, 1052038), (26, 809260), (40, 526019), (43, 489320), (52, 404630), (65, 323704), (86, 244660), (104, 202315), (130, 161852), (172, 122330), (215, 97864), (260, 80926), (344, 61165), (430, 48932), (520, 40463), (559, 37640), (860, 24466), (941, 22360), (1118, 18820), (1720, 12233), (1882, 11180), (2236, 9410), (2795, 7528), (3764, 5590), (4472, 4705)]