21390580

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{181}}^1\times {\mathrm{311}}^1$

素因数の和:520

約数の個数: 48

約数和(自身を含む): 47698560

約数和(自身を除く): 26307980

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 76, 95, 181, 190, 311, 362, 380, 622, 724, 905, 1244, 1555, 1810, 3110, 3439, 3620, 5909, 6220, 6878, 11818, 13756, 17195, 23636, 29545, 34390, 56291, 59090, 68780, 112582, 118180, 225164, 281455, 562910, 1069529, 1125820, 2139058, 4278116, 5347645, 10695290, 21390580]

約数ペア:

[(1, 21390580), (2, 10695290), (4, 5347645), (5, 4278116), (10, 2139058), (19, 1125820), (20, 1069529), (38, 562910), (76, 281455), (95, 225164), (181, 118180), (190, 112582), (311, 68780), (362, 59090), (380, 56291), (622, 34390), (724, 29545), (905, 23636), (1244, 17195), (1555, 13756), (1810, 11818), (3110, 6878), (3439, 6220), (3620, 5909)]