21356516

素因数分解:

$2^2\times {\mathrm{71}}^1\times {\mathrm{139}}^1\times {\mathrm{541}}^1$

素因数の和:755

約数の個数: 24

約数和(自身を含む): 38243520

約数和(自身を除く): 16887004

約数列:

[1, 2, 4, 71, 139, 142, 278, 284, 541, 556, 1082, 2164, 9869, 19738, 38411, 39476, 75199, 76822, 150398, 153644, 300796, 5339129, 10678258, 21356516]

約数ペア:

[(1, 21356516), (2, 10678258), (4, 5339129), (71, 300796), (139, 153644), (142, 150398), (278, 76822), (284, 75199), (541, 39476), (556, 38411), (1082, 19738), (2164, 9869)]