21980504

素因数分解:

$2^3\times 7^1\times {\mathrm{13}}^1\times {\mathrm{109}}^1\times {\mathrm{277}}^1$

素因数の和:412

約数の個数: 64

約数和(自身を含む): 51374400

約数和(自身を除く): 29393896

約数列:

[1, 2, 4, 7, 8, 13, 14, 26, 28, 52, 56, 91, 104, 109, 182, 218, 277, 364, 436, 554, 728, 763, 872, 1108, 1417, 1526, 1939, 2216, 2834, 3052, 3601, 3878, 5668, 6104, 7202, 7756, 9919, 11336, 14404, 15512, 19838, 25207, 28808, 30193, 39676, 50414, 60386, 79352, 100828, 120772, 201656, 211351, 241544, 392509, 422702, 785018, 845404, 1570036, 1690808, 2747563, 3140072, 5495126, 10990252, 21980504]

約数ペア:

[(1, 21980504), (2, 10990252), (4, 5495126), (7, 3140072), (8, 2747563), (13, 1690808), (14, 1570036), (26, 845404), (28, 785018), (52, 422702), (56, 392509), (91, 241544), (104, 211351), (109, 201656), (182, 120772), (218, 100828), (277, 79352), (364, 60386), (436, 50414), (554, 39676), (728, 30193), (763, 28808), (872, 25207), (1108, 19838), (1417, 15512), (1526, 14404), (1939, 11336), (2216, 9919), (2834, 7756), (3052, 7202), (3601, 6104), (3878, 5668)]