21209487

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{53}}^1\times {\mathrm{331}}^1$

素因数の和:431

約数の個数: 32

約数和(自身を含む): 32126976

約数和(自身を除く): 10917489

約数列:

[1, 3, 13, 31, 39, 53, 93, 159, 331, 403, 689, 993, 1209, 1643, 2067, 4303, 4929, 10261, 12909, 17543, 21359, 30783, 52629, 64077, 133393, 228059, 400179, 543833, 684177, 1631499, 7069829, 21209487]

約数ペア:

[(1, 21209487), (3, 7069829), (13, 1631499), (31, 684177), (39, 543833), (53, 400179), (93, 228059), (159, 133393), (331, 64077), (403, 52629), (689, 30783), (993, 21359), (1209, 17543), (1643, 12909), (2067, 10261), (4303, 4929)]