64840120

素因数分解:

$2^3\times 5^1\times {\mathrm{643}}^1\times {\mathrm{2521}}^1$

素因数の和:3175

約数の個数: 32

約数和(自身を含む): 146175120

約数和(自身を除く): 81335000

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 643, 1286, 2521, 2572, 3215, 5042, 5144, 6430, 10084, 12605, 12860, 20168, 25210, 25720, 50420, 100840, 1621003, 3242006, 6484012, 8105015, 12968024, 16210030, 32420060, 64840120]

約数ペア:

[(1, 64840120), (2, 32420060), (4, 16210030), (5, 12968024), (8, 8105015), (10, 6484012), (20, 3242006), (40, 1621003), (643, 100840), (1286, 50420), (2521, 25720), (2572, 25210), (3215, 20168), (5042, 12860), (5144, 12605), (6430, 10084)]