21290521

素因数分解:

$7^1\times {\mathrm{31}}^1\times {\mathrm{41}}^1\times {\mathrm{2393}}^1$

素因数の和:2472

約数の個数: 16

約数和(自身を含む): 25740288

約数和(自身を除く): 4449767

約数列:

[1, 7, 31, 41, 217, 287, 1271, 2393, 8897, 16751, 74183, 98113, 519281, 686791, 3041503, 21290521]

約数ペア:

[(1, 21290521), (7, 3041503), (31, 686791), (41, 519281), (217, 98113), (287, 74183), (1271, 16751), (2393, 8897)]