18980728

素因数分解:

$2^3\times {\mathrm{13}}^2\times {\mathrm{101}}^1\times {\mathrm{139}}^1$

素因数の和:272

約数の個数: 48

約数和(自身を含む): 39198600

約数和(自身を除く): 20217872

約数列:

[1, 2, 4, 8, 13, 26, 52, 101, 104, 139, 169, 202, 278, 338, 404, 556, 676, 808, 1112, 1313, 1352, 1807, 2626, 3614, 5252, 7228, 10504, 14039, 14456, 17069, 23491, 28078, 34138, 46982, 56156, 68276, 93964, 112312, 136552, 182507, 187928, 365014, 730028, 1460056, 2372591, 4745182, 9490364, 18980728]

約数ペア:

[(1, 18980728), (2, 9490364), (4, 4745182), (8, 2372591), (13, 1460056), (26, 730028), (52, 365014), (101, 187928), (104, 182507), (139, 136552), (169, 112312), (202, 93964), (278, 68276), (338, 56156), (404, 46982), (556, 34138), (676, 28078), (808, 23491), (1112, 17069), (1313, 14456), (1352, 14039), (1807, 10504), (2626, 7228), (3614, 5252)]