20990142

素因数分解:

$2^1\times 3^2\times {\mathrm{29}}^1\times {\mathrm{79}}^1\times {\mathrm{509}}^1$

素因数の和:625

約数の個数: 48

約数和(自身を含む): 47736000

約数和(自身を除く): 26745858

約数列:

[1, 2, 3, 6, 9, 18, 29, 58, 79, 87, 158, 174, 237, 261, 474, 509, 522, 711, 1018, 1422, 1527, 2291, 3054, 4581, 4582, 6873, 9162, 13746, 14761, 20619, 29522, 40211, 41238, 44283, 80422, 88566, 120633, 132849, 241266, 265698, 361899, 723798, 1166119, 2332238, 3498357, 6996714, 10495071, 20990142]

約数ペア:

[(1, 20990142), (2, 10495071), (3, 6996714), (6, 3498357), (9, 2332238), (18, 1166119), (29, 723798), (58, 361899), (79, 265698), (87, 241266), (158, 132849), (174, 120633), (237, 88566), (261, 80422), (474, 44283), (509, 41238), (522, 40211), (711, 29522), (1018, 20619), (1422, 14761), (1527, 13746), (2291, 9162), (3054, 6873), (4581, 4582)]