19908790

素因数分解:

$2^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{29}}^1\times {\mathrm{79}}^2$

素因数の和:205

約数の個数: 48

約数和(自身を含む): 40960080

約数和(自身を除く): 21051290

約数列:

[1, 2, 5, 10, 11, 22, 29, 55, 58, 79, 110, 145, 158, 290, 319, 395, 638, 790, 869, 1595, 1738, 2291, 3190, 4345, 4582, 6241, 8690, 11455, 12482, 22910, 25201, 31205, 50402, 62410, 68651, 126005, 137302, 180989, 252010, 343255, 361978, 686510, 904945, 1809890, 1990879, 3981758, 9954395, 19908790]

約数ペア:

[(1, 19908790), (2, 9954395), (5, 3981758), (10, 1990879), (11, 1809890), (22, 904945), (29, 686510), (55, 361978), (58, 343255), (79, 252010), (110, 180989), (145, 137302), (158, 126005), (290, 68651), (319, 62410), (395, 50402), (638, 31205), (790, 25201), (869, 22910), (1595, 12482), (1738, 11455), (2291, 8690), (3190, 6241), (4345, 4582)]