21216255

素因数分解:

$3^1\times 5^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{29}}^1\times {\mathrm{151}}^1$

素因数の和:224

約数の個数: 64

約数和(自身を含む): 39398400

約数和(自身を除く): 18182145

約数列:

[1, 3, 5, 15, 17, 19, 29, 51, 57, 85, 87, 95, 145, 151, 255, 285, 323, 435, 453, 493, 551, 755, 969, 1479, 1615, 1653, 2265, 2465, 2567, 2755, 2869, 4379, 4845, 7395, 7701, 8265, 8607, 9367, 12835, 13137, 14345, 21895, 28101, 38505, 43035, 46835, 48773, 65685, 74443, 83201, 140505, 146319, 223329, 243865, 249603, 372215, 416005, 731595, 1116645, 1248015, 1414417, 4243251, 7072085, 21216255]

約数ペア:

[(1, 21216255), (3, 7072085), (5, 4243251), (15, 1414417), (17, 1248015), (19, 1116645), (29, 731595), (51, 416005), (57, 372215), (85, 249603), (87, 243865), (95, 223329), (145, 146319), (151, 140505), (255, 83201), (285, 74443), (323, 65685), (435, 48773), (453, 46835), (493, 43035), (551, 38505), (755, 28101), (969, 21895), (1479, 14345), (1615, 13137), (1653, 12835), (2265, 9367), (2465, 8607), (2567, 8265), (2755, 7701), (2869, 7395), (4379, 4845)]