21561925

素因数分解:

$5^2\times 7^1\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{487}}^1$

素因数の和:538

約数の個数: 48

約数和(自身を含む): 34854912

約数和(自身を除く): 13292987

約数列:

[1, 5, 7, 11, 23, 25, 35, 55, 77, 115, 161, 175, 253, 275, 385, 487, 575, 805, 1265, 1771, 1925, 2435, 3409, 4025, 5357, 6325, 8855, 11201, 12175, 17045, 26785, 37499, 44275, 56005, 78407, 85225, 123211, 133925, 187495, 280025, 392035, 616055, 862477, 937475, 1960175, 3080275, 4312385, 21561925]

約数ペア:

[(1, 21561925), (5, 4312385), (7, 3080275), (11, 1960175), (23, 937475), (25, 862477), (35, 616055), (55, 392035), (77, 280025), (115, 187495), (161, 133925), (175, 123211), (253, 85225), (275, 78407), (385, 56005), (487, 44275), (575, 37499), (805, 26785), (1265, 17045), (1771, 12175), (1925, 11201), (2435, 8855), (3409, 6325), (4025, 5357)]