21818517

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{149}}^1\times {\mathrm{367}}^1$

素因数の和:545

約数の個数: 32

約数和(自身を含む): 35328000

約数和(自身を除く): 13509483

約数列:

[1, 3, 7, 19, 21, 57, 133, 149, 367, 399, 447, 1043, 1101, 2569, 2831, 3129, 6973, 7707, 8493, 19817, 20919, 48811, 54683, 59451, 146433, 164049, 382781, 1038977, 1148343, 3116931, 7272839, 21818517]

約数ペア:

[(1, 21818517), (3, 7272839), (7, 3116931), (19, 1148343), (21, 1038977), (57, 382781), (133, 164049), (149, 146433), (367, 59451), (399, 54683), (447, 48811), (1043, 20919), (1101, 19817), (2569, 8493), (2831, 7707), (3129, 6973)]