21517756

素因数分解:

$2^2\times {\mathrm{13}}^2\times {\mathrm{139}}^1\times {\mathrm{229}}^1$

素因数の和:398

約数の個数: 36

約数和(自身を含む): 41248200

約数和(自身を除く): 19730444

約数列:

[1, 2, 4, 13, 26, 52, 139, 169, 229, 278, 338, 458, 556, 676, 916, 1807, 2977, 3614, 5954, 7228, 11908, 23491, 31831, 38701, 46982, 63662, 77402, 93964, 127324, 154804, 413803, 827606, 1655212, 5379439, 10758878, 21517756]

約数ペア:

[(1, 21517756), (2, 10758878), (4, 5379439), (13, 1655212), (26, 827606), (52, 413803), (139, 154804), (169, 127324), (229, 93964), (278, 77402), (338, 63662), (458, 46982), (556, 38701), (676, 31831), (916, 23491), (1807, 11908), (2977, 7228), (3614, 5954)]