20406880

素因数分解:

$2^5\times 5^1\times {\mathrm{13}}^1\times {\mathrm{9811}}^1$

素因数の和:9839

約数の個数: 48

約数和(自身を含む): 51925104

約数和(自身を除く): 31518224

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 40, 52, 65, 80, 104, 130, 160, 208, 260, 416, 520, 1040, 2080, 9811, 19622, 39244, 49055, 78488, 98110, 127543, 156976, 196220, 255086, 313952, 392440, 510172, 637715, 784880, 1020344, 1275430, 1569760, 2040688, 2550860, 4081376, 5101720, 10203440, 20406880]

約数ペア:

[(1, 20406880), (2, 10203440), (4, 5101720), (5, 4081376), (8, 2550860), (10, 2040688), (13, 1569760), (16, 1275430), (20, 1020344), (26, 784880), (32, 637715), (40, 510172), (52, 392440), (65, 313952), (80, 255086), (104, 196220), (130, 156976), (160, 127543), (208, 98110), (260, 78488), (416, 49055), (520, 39244), (1040, 19622), (2080, 9811)]