20017431

素因数分解:

$3^2\times 7^2\times {\mathrm{19}}^1\times {\mathrm{2389}}^1$

素因数の和:2428

約数の個数: 36

約数和(自身を含む): 35419800

約数和(自身を除く): 15402369

約数列:

[1, 3, 7, 9, 19, 21, 49, 57, 63, 133, 147, 171, 399, 441, 931, 1197, 2389, 2793, 7167, 8379, 16723, 21501, 45391, 50169, 117061, 136173, 150507, 317737, 351183, 408519, 953211, 1053549, 2224159, 2859633, 6672477, 20017431]

約数ペア:

[(1, 20017431), (3, 6672477), (7, 2859633), (9, 2224159), (19, 1053549), (21, 953211), (49, 408519), (57, 351183), (63, 317737), (133, 150507), (147, 136173), (171, 117061), (399, 50169), (441, 45391), (931, 21501), (1197, 16723), (2389, 8379), (2793, 7167)]