21511990

素因数分解:

$2^1\times 5^1\times {\mathrm{19}}^2\times {\mathrm{59}}^1\times {\mathrm{101}}^1$

素因数の和:205

約数の個数: 48

約数和(自身を含む): 41970960

約数和(自身を除く): 20458970

約数列:

[1, 2, 5, 10, 19, 38, 59, 95, 101, 118, 190, 202, 295, 361, 505, 590, 722, 1010, 1121, 1805, 1919, 2242, 3610, 3838, 5605, 5959, 9595, 11210, 11918, 19190, 21299, 29795, 36461, 42598, 59590, 72922, 106495, 113221, 182305, 212990, 226442, 364610, 566105, 1132210, 2151199, 4302398, 10755995, 21511990]

約数ペア:

[(1, 21511990), (2, 10755995), (5, 4302398), (10, 2151199), (19, 1132210), (38, 566105), (59, 364610), (95, 226442), (101, 212990), (118, 182305), (190, 113221), (202, 106495), (295, 72922), (361, 59590), (505, 42598), (590, 36461), (722, 29795), (1010, 21299), (1121, 19190), (1805, 11918), (1919, 11210), (2242, 9595), (3610, 5959), (3838, 5605)]