81720009

素因数分解:

$3^4\times 7^1\times {\mathrm{101}}^1\times {\mathrm{1427}}^1$

素因数の和:1547

約数の個数: 40

約数和(自身を含む): 140995008

約数和(自身を除く): 59274999

約数列:

[1, 3, 7, 9, 21, 27, 63, 81, 101, 189, 303, 567, 707, 909, 1427, 2121, 2727, 4281, 6363, 8181, 9989, 12843, 19089, 29967, 38529, 57267, 89901, 115587, 144127, 269703, 432381, 809109, 1008889, 1297143, 3026667, 3891429, 9080001, 11674287, 27240003, 81720009]

約数ペア:

[(1, 81720009), (3, 27240003), (7, 11674287), (9, 9080001), (21, 3891429), (27, 3026667), (63, 1297143), (81, 1008889), (101, 809109), (189, 432381), (303, 269703), (567, 144127), (707, 115587), (909, 89901), (1427, 57267), (2121, 38529), (2727, 29967), (4281, 19089), (6363, 12843), (8181, 9989)]