21308749

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{79}}^1\times {\mathrm{113}}^1$

素因数の和:241

約数の個数: 32

約数和(自身を含む): 28016640

約数和(自身を除く): 6707891

約数列:

[1, 7, 11, 31, 77, 79, 113, 217, 341, 553, 791, 869, 1243, 2387, 2449, 3503, 6083, 8701, 8927, 17143, 24521, 26939, 38533, 62489, 98197, 188573, 269731, 276737, 687379, 1937159, 3044107, 21308749]

約数ペア:

[(1, 21308749), (7, 3044107), (11, 1937159), (31, 687379), (77, 276737), (79, 269731), (113, 188573), (217, 98197), (341, 62489), (553, 38533), (791, 26939), (869, 24521), (1243, 17143), (2387, 8927), (2449, 8701), (3503, 6083)]