19919991

素因数分解:

$3^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{131}}^1\times {\mathrm{557}}^1$

素因数の和:711

約数の個数: 32

約数和(自身を含む): 32997888

約数和(自身を除く): 13077897

約数列:

[1, 3, 7, 13, 21, 39, 91, 131, 273, 393, 557, 917, 1671, 1703, 2751, 3899, 5109, 7241, 11697, 11921, 21723, 35763, 50687, 72967, 152061, 218901, 510769, 948571, 1532307, 2845713, 6639997, 19919991]

約数ペア:

[(1, 19919991), (3, 6639997), (7, 2845713), (13, 1532307), (21, 948571), (39, 510769), (91, 218901), (131, 152061), (273, 72967), (393, 50687), (557, 35763), (917, 21723), (1671, 11921), (1703, 11697), (2751, 7241), (3899, 5109)]