19998420

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{25639}}^1$

素因数の和:25664

約数の個数: 48

約数和(自身を含む): 60305280

約数和(自身を除く): 40306860

約数列:

[1, 2, 3, 4, 5, 6, 10, 12, 13, 15, 20, 26, 30, 39, 52, 60, 65, 78, 130, 156, 195, 260, 390, 780, 25639, 51278, 76917, 102556, 128195, 153834, 256390, 307668, 333307, 384585, 512780, 666614, 769170, 999921, 1333228, 1538340, 1666535, 1999842, 3333070, 3999684, 4999605, 6666140, 9999210, 19998420]

約数ペア:

[(1, 19998420), (2, 9999210), (3, 6666140), (4, 4999605), (5, 3999684), (6, 3333070), (10, 1999842), (12, 1666535), (13, 1538340), (15, 1333228), (20, 999921), (26, 769170), (30, 666614), (39, 512780), (52, 384585), (60, 333307), (65, 307668), (78, 256390), (130, 153834), (156, 128195), (195, 102556), (260, 76917), (390, 51278), (780, 25639)]