21387128

素因数分解:

$2^3\times 7^2\times {\mathrm{54559}}^1$

素因数の和:54579

約数の個数: 24

約数和(自身を含む): 46648800

約数和(自身を除く): 25261672

約数列:

[1, 2, 4, 7, 8, 14, 28, 49, 56, 98, 196, 392, 54559, 109118, 218236, 381913, 436472, 763826, 1527652, 2673391, 3055304, 5346782, 10693564, 21387128]

約数ペア:

[(1, 21387128), (2, 10693564), (4, 5346782), (7, 3055304), (8, 2673391), (14, 1527652), (28, 763826), (49, 436472), (56, 381913), (98, 218236), (196, 109118), (392, 54559)]