21129225

素因数分解:

$3^1\times 5^2\times {\mathrm{13}}^2\times {\mathrm{1667}}^1$

素因数の和:1706

約数の個数: 36

約数和(自身を含む): 37850256

約数和(自身を除く): 16721031

約数列:

[1, 3, 5, 13, 15, 25, 39, 65, 75, 169, 195, 325, 507, 845, 975, 1667, 2535, 4225, 5001, 8335, 12675, 21671, 25005, 41675, 65013, 108355, 125025, 281723, 325065, 541775, 845169, 1408615, 1625325, 4225845, 7043075, 21129225]

約数ペア:

[(1, 21129225), (3, 7043075), (5, 4225845), (13, 1625325), (15, 1408615), (25, 845169), (39, 541775), (65, 325065), (75, 281723), (169, 125025), (195, 108355), (325, 65013), (507, 41675), (845, 25005), (975, 21671), (1667, 12675), (2535, 8335), (4225, 5001)]