21490007

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{37}}^1\times {\mathrm{397}}^1$

素因数の和:471

約数の個数: 32

約数和(自身を含む): 29038080

約数和(自身を除く): 7548073

約数列:

[1, 7, 11, 19, 37, 77, 133, 209, 259, 397, 407, 703, 1463, 2779, 2849, 4367, 4921, 7543, 7733, 14689, 30569, 52801, 54131, 82973, 102823, 161579, 279091, 580811, 1131053, 1953637, 3070001, 21490007]

約数ペア:

[(1, 21490007), (7, 3070001), (11, 1953637), (19, 1131053), (37, 580811), (77, 279091), (133, 161579), (209, 102823), (259, 82973), (397, 54131), (407, 52801), (703, 30569), (1463, 14689), (2779, 7733), (2849, 7543), (4367, 4921)]