21002980

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^2\times {\mathrm{2909}}^1$

素因数の和:2956

約数の個数: 36

約数和(自身を含む): 46565820

約数和(自身を除く): 25562840

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 76, 95, 190, 361, 380, 722, 1444, 1805, 2909, 3610, 5818, 7220, 11636, 14545, 29090, 55271, 58180, 110542, 221084, 276355, 552710, 1050149, 1105420, 2100298, 4200596, 5250745, 10501490, 21002980]

約数ペア:

[(1, 21002980), (2, 10501490), (4, 5250745), (5, 4200596), (10, 2100298), (19, 1105420), (20, 1050149), (38, 552710), (76, 276355), (95, 221084), (190, 110542), (361, 58180), (380, 55271), (722, 29090), (1444, 14545), (1805, 11636), (2909, 7220), (3610, 5818)]