20997907

素因数分解:

$7^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{37}}^1\times {\mathrm{251}}^1$

素因数の和:331

約数の個数: 32

約数和(自身を含む): 27578880

約数和(自身を除く): 6580973

約数列:

[1, 7, 17, 19, 37, 119, 133, 251, 259, 323, 629, 703, 1757, 2261, 4267, 4403, 4769, 4921, 9287, 11951, 29869, 33383, 65009, 81073, 83657, 157879, 176453, 567511, 1105153, 1235171, 2999701, 20997907]

約数ペア:

[(1, 20997907), (7, 2999701), (17, 1235171), (19, 1105153), (37, 567511), (119, 176453), (133, 157879), (251, 83657), (259, 81073), (323, 65009), (629, 33383), (703, 29869), (1757, 11951), (2261, 9287), (4267, 4921), (4403, 4769)]