20865761

素因数分解:

$7^1\times {\mathrm{23}}^1\times {\mathrm{29}}^1\times {\mathrm{41}}^1\times {\mathrm{109}}^1$

素因数の和:209

約数の個数: 32

約数和(自身を含む): 26611200

約数和(自身を除く): 5745439

約数列:

[1, 7, 23, 29, 41, 109, 161, 203, 287, 667, 763, 943, 1189, 2507, 3161, 4469, 4669, 6601, 8323, 17549, 22127, 27347, 31283, 72703, 102787, 129601, 191429, 508921, 719509, 907207, 2980823, 20865761]

約数ペア:

[(1, 20865761), (7, 2980823), (23, 907207), (29, 719509), (41, 508921), (109, 191429), (161, 129601), (203, 102787), (287, 72703), (667, 31283), (763, 27347), (943, 22127), (1189, 17549), (2507, 8323), (3161, 6601), (4469, 4669)]