21138955

素因数分解:

$5^1\times {\mathrm{23}}^1\times {\mathrm{47}}^1\times {\mathrm{3911}}^1$

素因数の和:3986

約数の個数: 16

約数和(自身を含む): 27039744

約数和(自身を除く): 5900789

約数列:

[1, 5, 23, 47, 115, 235, 1081, 3911, 5405, 19555, 89953, 183817, 449765, 919085, 4227791, 21138955]

約数ペア:

[(1, 21138955), (5, 4227791), (23, 919085), (47, 449765), (115, 183817), (235, 89953), (1081, 19555), (3911, 5405)]