21381787

素因数分解:

$7^2\times {\mathrm{29}}^1\times {\mathrm{41}}^1\times {\mathrm{367}}^1$

素因数の和:451

約数の個数: 24

約数和(自身を含む): 26429760

約数和(自身を除く): 5047973

約数列:

[1, 7, 29, 41, 49, 203, 287, 367, 1189, 1421, 2009, 2569, 8323, 10643, 15047, 17983, 58261, 74501, 105329, 436363, 521507, 737303, 3054541, 21381787]

約数ペア:

[(1, 21381787), (7, 3054541), (29, 737303), (41, 521507), (49, 436363), (203, 105329), (287, 74501), (367, 58261), (1189, 17983), (1421, 15047), (2009, 10643), (2569, 8323)]