20561000

素因数分解:

$2^3\times 5^3\times {\mathrm{29}}^1\times {\mathrm{709}}^1$

素因数の和:759

約数の個数: 64

約数和(自身を含む): 49842000

約数和(自身を除く): 29281000

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 29, 40, 50, 58, 100, 116, 125, 145, 200, 232, 250, 290, 500, 580, 709, 725, 1000, 1160, 1418, 1450, 2836, 2900, 3545, 3625, 5672, 5800, 7090, 7250, 14180, 14500, 17725, 20561, 28360, 29000, 35450, 41122, 70900, 82244, 88625, 102805, 141800, 164488, 177250, 205610, 354500, 411220, 514025, 709000, 822440, 1028050, 2056100, 2570125, 4112200, 5140250, 10280500, 20561000]

約数ペア:

[(1, 20561000), (2, 10280500), (4, 5140250), (5, 4112200), (8, 2570125), (10, 2056100), (20, 1028050), (25, 822440), (29, 709000), (40, 514025), (50, 411220), (58, 354500), (100, 205610), (116, 177250), (125, 164488), (145, 141800), (200, 102805), (232, 88625), (250, 82244), (290, 70900), (500, 41122), (580, 35450), (709, 29000), (725, 28360), (1000, 20561), (1160, 17725), (1418, 14500), (1450, 14180), (2836, 7250), (2900, 7090), (3545, 5800), (3625, 5672)]