21658840

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{103}}^1\times {\mathrm{751}}^1$

素因数の和:872

約数の個数: 64

約数和(自身を含む): 56309760

約数和(自身を除く): 34650920

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 103, 140, 206, 280, 412, 515, 721, 751, 824, 1030, 1442, 1502, 2060, 2884, 3004, 3605, 3755, 4120, 5257, 5768, 6008, 7210, 7510, 10514, 14420, 15020, 21028, 26285, 28840, 30040, 42056, 52570, 77353, 105140, 154706, 210280, 309412, 386765, 541471, 618824, 773530, 1082942, 1547060, 2165884, 2707355, 3094120, 4331768, 5414710, 10829420, 21658840]

約数ペア:

[(1, 21658840), (2, 10829420), (4, 5414710), (5, 4331768), (7, 3094120), (8, 2707355), (10, 2165884), (14, 1547060), (20, 1082942), (28, 773530), (35, 618824), (40, 541471), (56, 386765), (70, 309412), (103, 210280), (140, 154706), (206, 105140), (280, 77353), (412, 52570), (515, 42056), (721, 30040), (751, 28840), (824, 26285), (1030, 21028), (1442, 15020), (1502, 14420), (2060, 10514), (2884, 7510), (3004, 7210), (3605, 6008), (3755, 5768), (4120, 5257)]