21653597

素因数分解:

$7^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{61}}^1\times {\mathrm{157}}^1$

素因数の和:261

約数の個数: 32

約数和(自身を含む): 28212480

約数和(自身を除く): 6558883

約数列:

[1, 7, 17, 19, 61, 119, 133, 157, 323, 427, 1037, 1099, 1159, 2261, 2669, 2983, 7259, 8113, 9577, 18683, 19703, 20881, 50711, 67039, 137921, 162809, 181963, 354977, 1139663, 1273741, 3093371, 21653597]

約数ペア:

[(1, 21653597), (7, 3093371), (17, 1273741), (19, 1139663), (61, 354977), (119, 181963), (133, 162809), (157, 137921), (323, 67039), (427, 50711), (1037, 20881), (1099, 19703), (1159, 18683), (2261, 9577), (2669, 8113), (2983, 7259)]