2561000

素因数分解:

$2^3\times 5^3\times {\mathrm{13}}^1\times {\mathrm{197}}^1$

素因数の和:231

約数の個数: 64

約数和(自身を含む): 6486480

約数和(自身を除く): 3925480

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 25, 26, 40, 50, 52, 65, 100, 104, 125, 130, 197, 200, 250, 260, 325, 394, 500, 520, 650, 788, 985, 1000, 1300, 1576, 1625, 1970, 2561, 2600, 3250, 3940, 4925, 5122, 6500, 7880, 9850, 10244, 12805, 13000, 19700, 20488, 24625, 25610, 39400, 49250, 51220, 64025, 98500, 102440, 128050, 197000, 256100, 320125, 512200, 640250, 1280500, 2561000]

約数ペア:

[(1, 2561000), (2, 1280500), (4, 640250), (5, 512200), (8, 320125), (10, 256100), (13, 197000), (20, 128050), (25, 102440), (26, 98500), (40, 64025), (50, 51220), (52, 49250), (65, 39400), (100, 25610), (104, 24625), (125, 20488), (130, 19700), (197, 13000), (200, 12805), (250, 10244), (260, 9850), (325, 7880), (394, 6500), (500, 5122), (520, 4925), (650, 3940), (788, 3250), (985, 2600), (1000, 2561), (1300, 1970), (1576, 1625)]