20399720

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{71}}^1\times {\mathrm{653}}^1$

素因数の和:746

約数の個数: 64

約数和(自身を含む): 50855040

約数和(自身を除く): 30455320

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 71, 88, 110, 142, 220, 284, 355, 440, 568, 653, 710, 781, 1306, 1420, 1562, 2612, 2840, 3124, 3265, 3905, 5224, 6248, 6530, 7183, 7810, 13060, 14366, 15620, 26120, 28732, 31240, 35915, 46363, 57464, 71830, 92726, 143660, 185452, 231815, 287320, 370904, 463630, 509993, 927260, 1019986, 1854520, 2039972, 2549965, 4079944, 5099930, 10199860, 20399720]

約数ペア:

[(1, 20399720), (2, 10199860), (4, 5099930), (5, 4079944), (8, 2549965), (10, 2039972), (11, 1854520), (20, 1019986), (22, 927260), (40, 509993), (44, 463630), (55, 370904), (71, 287320), (88, 231815), (110, 185452), (142, 143660), (220, 92726), (284, 71830), (355, 57464), (440, 46363), (568, 35915), (653, 31240), (710, 28732), (781, 26120), (1306, 15620), (1420, 14366), (1562, 13060), (2612, 7810), (2840, 7183), (3124, 6530), (3265, 6248), (3905, 5224)]