21671991

素因数分解:

$3^2\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{79}}^1\times {\mathrm{163}}^1$

素因数の和:276

約数の個数: 48

約数和(自身を含む): 36840960

約数和(自身を除く): 15168969

約数列:

[1, 3, 9, 11, 17, 33, 51, 79, 99, 153, 163, 187, 237, 489, 561, 711, 869, 1343, 1467, 1683, 1793, 2607, 2771, 4029, 5379, 7821, 8313, 12087, 12877, 14773, 16137, 24939, 30481, 38631, 44319, 91443, 115893, 132957, 141647, 218909, 274329, 424941, 656727, 1274823, 1970181, 2407999, 7223997, 21671991]

約数ペア:

[(1, 21671991), (3, 7223997), (9, 2407999), (11, 1970181), (17, 1274823), (33, 656727), (51, 424941), (79, 274329), (99, 218909), (153, 141647), (163, 132957), (187, 115893), (237, 91443), (489, 44319), (561, 38631), (711, 30481), (869, 24939), (1343, 16137), (1467, 14773), (1683, 12877), (1793, 12087), (2607, 8313), (2771, 7821), (4029, 5379)]