21111850

素因数分解:

$2^1\times 5^2\times {\mathrm{19}}^1\times {\mathrm{71}}^1\times {\mathrm{313}}^1$

素因数の和:415

約数の個数: 48

約数和(自身を含む): 42050880

約数和(自身を除く): 20939030

約数列:

[1, 2, 5, 10, 19, 25, 38, 50, 71, 95, 142, 190, 313, 355, 475, 626, 710, 950, 1349, 1565, 1775, 2698, 3130, 3550, 5947, 6745, 7825, 11894, 13490, 15650, 22223, 29735, 33725, 44446, 59470, 67450, 111115, 148675, 222230, 297350, 422237, 555575, 844474, 1111150, 2111185, 4222370, 10555925, 21111850]

約数ペア:

[(1, 21111850), (2, 10555925), (5, 4222370), (10, 2111185), (19, 1111150), (25, 844474), (38, 555575), (50, 422237), (71, 297350), (95, 222230), (142, 148675), (190, 111115), (313, 67450), (355, 59470), (475, 44446), (626, 33725), (710, 29735), (950, 22223), (1349, 15650), (1565, 13490), (1775, 11894), (2698, 7825), (3130, 6745), (3550, 5947)]