81721220

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{83389}}^1$

素因数の和:83412

約数の個数: 36

約数和(自身を含む): 199635660

約数和(自身を除く): 117914440

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 140, 196, 245, 490, 980, 83389, 166778, 333556, 416945, 583723, 833890, 1167446, 1667780, 2334892, 2918615, 4086061, 5837230, 8172122, 11674460, 16344244, 20430305, 40860610, 81721220]

約数ペア:

[(1, 81721220), (2, 40860610), (4, 20430305), (5, 16344244), (7, 11674460), (10, 8172122), (14, 5837230), (20, 4086061), (28, 2918615), (35, 2334892), (49, 1667780), (70, 1167446), (98, 833890), (140, 583723), (196, 416945), (245, 333556), (490, 166778), (980, 83389)]