21282940

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{281}}^1\times {\mathrm{541}}^1$

素因数の和:838

約数の個数: 48

約数和(自身を含む): 51355584

約数和(自身を除く): 30072644

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 281, 541, 562, 1082, 1124, 1405, 1967, 2164, 2705, 2810, 3787, 3934, 5410, 5620, 7574, 7868, 9835, 10820, 15148, 18935, 19670, 37870, 39340, 75740, 152021, 304042, 608084, 760105, 1064147, 1520210, 2128294, 3040420, 4256588, 5320735, 10641470, 21282940]

約数ペア:

[(1, 21282940), (2, 10641470), (4, 5320735), (5, 4256588), (7, 3040420), (10, 2128294), (14, 1520210), (20, 1064147), (28, 760105), (35, 608084), (70, 304042), (140, 152021), (281, 75740), (541, 39340), (562, 37870), (1082, 19670), (1124, 18935), (1405, 15148), (1967, 10820), (2164, 9835), (2705, 7868), (2810, 7574), (3787, 5620), (3934, 5410)]