20947840

素因数分解:

$2^7\times 5^1\times {\mathrm{71}}^1\times {\mathrm{461}}^1$

素因数の和:551

約数の個数: 64

約数和(自身を含む): 50893920

約数和(自身を除く): 29946080

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 71, 80, 128, 142, 160, 284, 320, 355, 461, 568, 640, 710, 922, 1136, 1420, 1844, 2272, 2305, 2840, 3688, 4544, 4610, 5680, 7376, 9088, 9220, 11360, 14752, 18440, 22720, 29504, 32731, 36880, 45440, 59008, 65462, 73760, 130924, 147520, 163655, 261848, 295040, 327310, 523696, 654620, 1047392, 1309240, 2094784, 2618480, 4189568, 5236960, 10473920, 20947840]

約数ペア:

[(1, 20947840), (2, 10473920), (4, 5236960), (5, 4189568), (8, 2618480), (10, 2094784), (16, 1309240), (20, 1047392), (32, 654620), (40, 523696), (64, 327310), (71, 295040), (80, 261848), (128, 163655), (142, 147520), (160, 130924), (284, 73760), (320, 65462), (355, 59008), (461, 45440), (568, 36880), (640, 32731), (710, 29504), (922, 22720), (1136, 18440), (1420, 14752), (1844, 11360), (2272, 9220), (2305, 9088), (2840, 7376), (3688, 5680), (4544, 4610)]