18516981

素因数分解:

$3^1\times 7^1\times {\mathrm{53}}^1\times {\mathrm{127}}^1\times {\mathrm{131}}^1$

素因数の和:321

約数の個数: 32

約数和(自身を含む): 29196288

約数和(自身を除く): 10679307

約数列:

[1, 3, 7, 21, 53, 127, 131, 159, 371, 381, 393, 889, 917, 1113, 2667, 2751, 6731, 6943, 16637, 20193, 20829, 47117, 48601, 49911, 116459, 141351, 145803, 349377, 881761, 2645283, 6172327, 18516981]

約数ペア:

[(1, 18516981), (3, 6172327), (7, 2645283), (21, 881761), (53, 349377), (127, 145803), (131, 141351), (159, 116459), (371, 49911), (381, 48601), (393, 47117), (889, 20829), (917, 20193), (1113, 16637), (2667, 6943), (2751, 6731)]