21051828

素因数分解:

$2^2\times 3^2\times 7^1\times {\mathrm{139}}^1\times {\mathrm{601}}^1$

素因数の和:757

約数の個数: 72

約数和(自身を含む): 61355840

約数和(自身を除く): 40304012

約数列:

[1, 2, 3, 4, 6, 7, 9, 12, 14, 18, 21, 28, 36, 42, 63, 84, 126, 139, 252, 278, 417, 556, 601, 834, 973, 1202, 1251, 1668, 1803, 1946, 2404, 2502, 2919, 3606, 3892, 4207, 5004, 5409, 5838, 7212, 8414, 8757, 10818, 11676, 12621, 16828, 17514, 21636, 25242, 35028, 37863, 50484, 75726, 83539, 151452, 167078, 250617, 334156, 501234, 584773, 751851, 1002468, 1169546, 1503702, 1754319, 2339092, 3007404, 3508638, 5262957, 7017276, 10525914, 21051828]

約数ペア:

[(1, 21051828), (2, 10525914), (3, 7017276), (4, 5262957), (6, 3508638), (7, 3007404), (9, 2339092), (12, 1754319), (14, 1503702), (18, 1169546), (21, 1002468), (28, 751851), (36, 584773), (42, 501234), (63, 334156), (84, 250617), (126, 167078), (139, 151452), (252, 83539), (278, 75726), (417, 50484), (556, 37863), (601, 35028), (834, 25242), (973, 21636), (1202, 17514), (1251, 16828), (1668, 12621), (1803, 11676), (1946, 10818), (2404, 8757), (2502, 8414), (2919, 7212), (3606, 5838), (3892, 5409), (4207, 5004)]