20991502

素因数分解:

$2^1\times 7^2\times {\mathrm{23}}^1\times {\mathrm{67}}^1\times {\mathrm{139}}^1$

素因数の和:245

約数の個数: 48

約数和(自身を含む): 39070080

約数和(自身を除く): 18078578

約数列:

[1, 2, 7, 14, 23, 46, 49, 67, 98, 134, 139, 161, 278, 322, 469, 938, 973, 1127, 1541, 1946, 2254, 3082, 3197, 3283, 6394, 6566, 6811, 9313, 10787, 13622, 18626, 21574, 22379, 44758, 65191, 75509, 130382, 151018, 156653, 214199, 313306, 428398, 456337, 912674, 1499393, 2998786, 10495751, 20991502]

約数ペア:

[(1, 20991502), (2, 10495751), (7, 2998786), (14, 1499393), (23, 912674), (46, 456337), (49, 428398), (67, 313306), (98, 214199), (134, 156653), (139, 151018), (161, 130382), (278, 75509), (322, 65191), (469, 44758), (938, 22379), (973, 21574), (1127, 18626), (1541, 13622), (1946, 10787), (2254, 9313), (3082, 6811), (3197, 6566), (3283, 6394)]