19991517

素因数分解:

$3^1\times 7^1\times {\mathrm{13}}^2\times {\mathrm{43}}^1\times {\mathrm{131}}^1$

素因数の和:210

約数の個数: 48

約数和(自身を含む): 34011648

約数和(自身を除く): 14020131

約数列:

[1, 3, 7, 13, 21, 39, 43, 91, 129, 131, 169, 273, 301, 393, 507, 559, 903, 917, 1183, 1677, 1703, 2751, 3549, 3913, 5109, 5633, 7267, 11739, 11921, 16899, 21801, 22139, 35763, 39431, 50869, 66417, 73229, 118293, 152607, 154973, 219687, 464919, 512603, 951977, 1537809, 2855931, 6663839, 19991517]

約数ペア:

[(1, 19991517), (3, 6663839), (7, 2855931), (13, 1537809), (21, 951977), (39, 512603), (43, 464919), (91, 219687), (129, 154973), (131, 152607), (169, 118293), (273, 73229), (301, 66417), (393, 50869), (507, 39431), (559, 35763), (903, 22139), (917, 21801), (1183, 16899), (1677, 11921), (1703, 11739), (2751, 7267), (3549, 5633), (3913, 5109)]