8400000021

素因数分解:

$3^1\times 7^1\times {\mathrm{19801}}^1\times {\mathrm{20201}}^1$

素因数の和:40012

約数の個数: 16

約数和(自身を含む): 12801280128

約数和(自身を除く): 4401280107

約数列:

[1, 3, 7, 21, 19801, 20201, 59403, 60603, 138607, 141407, 415821, 424221, 400000001, 1200000003, 2800000007, 8400000021]

約数ペア:

[(1, 8400000021), (3, 2800000007), (7, 1200000003), (21, 400000001), (19801, 424221), (20201, 415821), (59403, 141407), (60603, 138607)]