20710781

素因数分解:

$7^2\times {\mathrm{13}}^2\times {\mathrm{41}}^1\times {\mathrm{61}}^1$

素因数の和:142

約数の個数: 36

約数和(自身を含む): 27162324

約数和(自身を除く): 6451543

約数列:

[1, 7, 13, 41, 49, 61, 91, 169, 287, 427, 533, 637, 793, 1183, 2009, 2501, 2989, 3731, 5551, 6929, 8281, 10309, 17507, 26117, 32513, 38857, 48503, 72163, 122549, 227591, 339521, 422669, 505141, 1593137, 2958683, 20710781]

約数ペア:

[(1, 20710781), (7, 2958683), (13, 1593137), (41, 505141), (49, 422669), (61, 339521), (91, 227591), (169, 122549), (287, 72163), (427, 48503), (533, 38857), (637, 32513), (793, 26117), (1183, 17507), (2009, 10309), (2501, 8281), (2989, 6929), (3731, 5551)]