19978480

素因数分解:

$2^4\times 5^1\times {\mathrm{41}}^1\times {\mathrm{6091}}^1$

素因数の和:6145

約数の個数: 40

約数和(自身を含む): 47590704

約数和(自身を除く): 27612224

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 41, 80, 82, 164, 205, 328, 410, 656, 820, 1640, 3280, 6091, 12182, 24364, 30455, 48728, 60910, 97456, 121820, 243640, 249731, 487280, 499462, 998924, 1248655, 1997848, 2497310, 3995696, 4994620, 9989240, 19978480]

約数ペア:

[(1, 19978480), (2, 9989240), (4, 4994620), (5, 3995696), (8, 2497310), (10, 1997848), (16, 1248655), (20, 998924), (40, 499462), (41, 487280), (80, 249731), (82, 243640), (164, 121820), (205, 97456), (328, 60910), (410, 48728), (656, 30455), (820, 24364), (1640, 12182), (3280, 6091)]