20391040

素因数分解:

$2^7\times 5^1\times {\mathrm{151}}^1\times {\mathrm{211}}^1$

素因数の和:381

約数の個数: 64

約数和(自身を含む): 49302720

約数和(自身を除く): 28911680

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 151, 160, 211, 302, 320, 422, 604, 640, 755, 844, 1055, 1208, 1510, 1688, 2110, 2416, 3020, 3376, 4220, 4832, 6040, 6752, 8440, 9664, 12080, 13504, 16880, 19328, 24160, 27008, 31861, 33760, 48320, 63722, 67520, 96640, 127444, 135040, 159305, 254888, 318610, 509776, 637220, 1019552, 1274440, 2039104, 2548880, 4078208, 5097760, 10195520, 20391040]

約数ペア:

[(1, 20391040), (2, 10195520), (4, 5097760), (5, 4078208), (8, 2548880), (10, 2039104), (16, 1274440), (20, 1019552), (32, 637220), (40, 509776), (64, 318610), (80, 254888), (128, 159305), (151, 135040), (160, 127444), (211, 96640), (302, 67520), (320, 63722), (422, 48320), (604, 33760), (640, 31861), (755, 27008), (844, 24160), (1055, 19328), (1208, 16880), (1510, 13504), (1688, 12080), (2110, 9664), (2416, 8440), (3020, 6752), (3376, 6040), (4220, 4832)]