19840720

素因数分解:

$2^4\times 5^1\times {\mathrm{23}}^1\times {\mathrm{41}}^1\times {\mathrm{263}}^1$

素因数の和:340

約数の個数: 80

約数和(自身を含む): 49496832

約数和(自身を除く): 29656112

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 23, 40, 41, 46, 80, 82, 92, 115, 164, 184, 205, 230, 263, 328, 368, 410, 460, 526, 656, 820, 920, 943, 1052, 1315, 1640, 1840, 1886, 2104, 2630, 3280, 3772, 4208, 4715, 5260, 6049, 7544, 9430, 10520, 10783, 12098, 15088, 18860, 21040, 21566, 24196, 30245, 37720, 43132, 48392, 53915, 60490, 75440, 86264, 96784, 107830, 120980, 172528, 215660, 241960, 248009, 431320, 483920, 496018, 862640, 992036, 1240045, 1984072, 2480090, 3968144, 4960180, 9920360, 19840720]

約数ペア:

[(1, 19840720), (2, 9920360), (4, 4960180), (5, 3968144), (8, 2480090), (10, 1984072), (16, 1240045), (20, 992036), (23, 862640), (40, 496018), (41, 483920), (46, 431320), (80, 248009), (82, 241960), (92, 215660), (115, 172528), (164, 120980), (184, 107830), (205, 96784), (230, 86264), (263, 75440), (328, 60490), (368, 53915), (410, 48392), (460, 43132), (526, 37720), (656, 30245), (820, 24196), (920, 21566), (943, 21040), (1052, 18860), (1315, 15088), (1640, 12098), (1840, 10783), (1886, 10520), (2104, 9430), (2630, 7544), (3280, 6049), (3772, 5260), (4208, 4715)]