21997913

素因数分解:

$7^2\times {\mathrm{23}}^1\times {\mathrm{131}}^1\times {\mathrm{149}}^1$

素因数の和:317

約数の個数: 24

約数和(自身を含む): 27086400

約数和(自身を除く): 5088487

約数列:

[1, 7, 23, 49, 131, 149, 161, 917, 1043, 1127, 3013, 3427, 6419, 7301, 19519, 21091, 23989, 136633, 147637, 167923, 448937, 956431, 3142559, 21997913]

約数ペア:

[(1, 21997913), (7, 3142559), (23, 956431), (49, 448937), (131, 167923), (149, 147637), (161, 136633), (917, 23989), (1043, 21091), (1127, 19519), (3013, 7301), (3427, 6419)]