21681710

素因数分解:

$2^1\times 5^1\times {\mathrm{31}}^1\times {\mathrm{69941}}^1$

素因数の和:69979

約数の個数: 16

約数和(自身を含む): 40286592

約数和(自身を除く): 18604882

約数列:

[1, 2, 5, 10, 31, 62, 155, 310, 69941, 139882, 349705, 699410, 2168171, 4336342, 10840855, 21681710]

約数ペア:

[(1, 21681710), (2, 10840855), (5, 4336342), (10, 2168171), (31, 699410), (62, 349705), (155, 139882), (310, 69941)]