21150745

素因数分解:

$5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{137}}^1\times {\mathrm{401}}^1$

素因数の和:561

約数の個数: 32

約数和(自身を含む): 31954176

約数和(自身を除く): 10803431

約数列:

[1, 5, 7, 11, 35, 55, 77, 137, 385, 401, 685, 959, 1507, 2005, 2807, 4411, 4795, 7535, 10549, 14035, 22055, 30877, 52745, 54937, 154385, 274685, 384559, 604307, 1922795, 3021535, 4230149, 21150745]

約数ペア:

[(1, 21150745), (5, 4230149), (7, 3021535), (11, 1922795), (35, 604307), (55, 384559), (77, 274685), (137, 154385), (385, 54937), (401, 52745), (685, 30877), (959, 22055), (1507, 14035), (2005, 10549), (2807, 7535), (4411, 4795)]