20538440

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{127}}^1\times {\mathrm{311}}^1$

素因数の和:462

約数の個数: 64

約数和(自身を含む): 50319360

約数和(自身を除く): 29780920

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 127, 130, 254, 260, 311, 508, 520, 622, 635, 1016, 1244, 1270, 1555, 1651, 2488, 2540, 3110, 3302, 4043, 5080, 6220, 6604, 8086, 8255, 12440, 13208, 16172, 16510, 20215, 32344, 33020, 39497, 40430, 66040, 78994, 80860, 157988, 161720, 197485, 315976, 394970, 513461, 789940, 1026922, 1579880, 2053844, 2567305, 4107688, 5134610, 10269220, 20538440]

約数ペア:

[(1, 20538440), (2, 10269220), (4, 5134610), (5, 4107688), (8, 2567305), (10, 2053844), (13, 1579880), (20, 1026922), (26, 789940), (40, 513461), (52, 394970), (65, 315976), (104, 197485), (127, 161720), (130, 157988), (254, 80860), (260, 78994), (311, 66040), (508, 40430), (520, 39497), (622, 33020), (635, 32344), (1016, 20215), (1244, 16510), (1270, 16172), (1555, 13208), (1651, 12440), (2488, 8255), (2540, 8086), (3110, 6604), (3302, 6220), (4043, 5080)]