20018440

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{137}}^1\times {\mathrm{281}}^1$

素因数の和:442

約数の個数: 64

約数和(自身を含む): 49034160

約数和(自身を除く): 29015720

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 137, 260, 274, 281, 520, 548, 562, 685, 1096, 1124, 1370, 1405, 1781, 2248, 2740, 2810, 3562, 3653, 5480, 5620, 7124, 7306, 8905, 11240, 14248, 14612, 17810, 18265, 29224, 35620, 36530, 38497, 71240, 73060, 76994, 146120, 153988, 192485, 307976, 384970, 500461, 769940, 1000922, 1539880, 2001844, 2502305, 4003688, 5004610, 10009220, 20018440]

約数ペア:

[(1, 20018440), (2, 10009220), (4, 5004610), (5, 4003688), (8, 2502305), (10, 2001844), (13, 1539880), (20, 1000922), (26, 769940), (40, 500461), (52, 384970), (65, 307976), (104, 192485), (130, 153988), (137, 146120), (260, 76994), (274, 73060), (281, 71240), (520, 38497), (548, 36530), (562, 35620), (685, 29224), (1096, 18265), (1124, 17810), (1370, 14612), (1405, 14248), (1781, 11240), (2248, 8905), (2740, 7306), (2810, 7124), (3562, 5620), (3653, 5480)]