20828225

素因数分解:

$5^2\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{37}}^1\times {\mathrm{89}}^1$

素因数の和:170

約数の個数: 48

約数和(自身を含む): 30533760

約数和(自身を除く): 9705535

約数列:

[1, 5, 11, 23, 25, 37, 55, 89, 115, 185, 253, 275, 407, 445, 575, 851, 925, 979, 1265, 2035, 2047, 2225, 3293, 4255, 4895, 6325, 9361, 10175, 10235, 16465, 21275, 22517, 24475, 36223, 46805, 51175, 75739, 82325, 112585, 181115, 234025, 378695, 562925, 833129, 905575, 1893475, 4165645, 20828225]

約数ペア:

[(1, 20828225), (5, 4165645), (11, 1893475), (23, 905575), (25, 833129), (37, 562925), (55, 378695), (89, 234025), (115, 181115), (185, 112585), (253, 82325), (275, 75739), (407, 51175), (445, 46805), (575, 36223), (851, 24475), (925, 22517), (979, 21275), (1265, 16465), (2035, 10235), (2047, 10175), (2225, 9361), (3293, 6325), (4255, 4895)]