21311997

素因数分解:

$3^1\times 7^1\times {\mathrm{61}}^1\times {\mathrm{127}}^1\times {\mathrm{131}}^1$

素因数の和:329

約数の個数: 32

約数和(自身を含む): 33521664

約数和(自身を除く): 12209667

約数列:

[1, 3, 7, 21, 61, 127, 131, 183, 381, 393, 427, 889, 917, 1281, 2667, 2751, 7747, 7991, 16637, 23241, 23973, 49911, 54229, 55937, 116459, 162687, 167811, 349377, 1014857, 3044571, 7103999, 21311997]

約数ペア:

[(1, 21311997), (3, 7103999), (7, 3044571), (21, 1014857), (61, 349377), (127, 167811), (131, 162687), (183, 116459), (381, 55937), (393, 54229), (427, 49911), (889, 23973), (917, 23241), (1281, 16637), (2667, 7991), (2751, 7747)]