21002840

素因数分解:

$2^3\times 5^1\times {\mathrm{53}}^1\times {\mathrm{9907}}^1$

素因数の和:9971

約数の個数: 32

約数和(自身を含む): 48152880

約数和(自身を除く): 27150040

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 53, 106, 212, 265, 424, 530, 1060, 2120, 9907, 19814, 39628, 49535, 79256, 99070, 198140, 396280, 525071, 1050142, 2100284, 2625355, 4200568, 5250710, 10501420, 21002840]

約数ペア:

[(1, 21002840), (2, 10501420), (4, 5250710), (5, 4200568), (8, 2625355), (10, 2100284), (20, 1050142), (40, 525071), (53, 396280), (106, 198140), (212, 99070), (265, 79256), (424, 49535), (530, 39628), (1060, 19814), (2120, 9907)]