21253947

素因数分解:

$3^1\times {\mathrm{11}}^1\times {\mathrm{13}}^2\times {\mathrm{37}}^1\times {\mathrm{103}}^1$

素因数の和:180

約数の個数: 48

約数和(自身を含む): 34714368

約数和(自身を除く): 13460421

約数列:

[1, 3, 11, 13, 33, 37, 39, 103, 111, 143, 169, 309, 407, 429, 481, 507, 1133, 1221, 1339, 1443, 1859, 3399, 3811, 4017, 5291, 5577, 6253, 11433, 14729, 15873, 17407, 18759, 41921, 44187, 49543, 52221, 68783, 125763, 148629, 191477, 206349, 544973, 574431, 644059, 1634919, 1932177, 7084649, 21253947]

約数ペア:

[(1, 21253947), (3, 7084649), (11, 1932177), (13, 1634919), (33, 644059), (37, 574431), (39, 544973), (103, 206349), (111, 191477), (143, 148629), (169, 125763), (309, 68783), (407, 52221), (429, 49543), (481, 44187), (507, 41921), (1133, 18759), (1221, 17407), (1339, 15873), (1443, 14729), (1859, 11433), (3399, 6253), (3811, 5577), (4017, 5291)]