20009990

素因数分解:

$2^1\times 5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{1999}}^1$

素因数の和:2037

約数の個数: 64

約数和(自身を含む): 48384000

約数和(自身を除く): 28374010

約数列:

[1, 2, 5, 7, 10, 11, 13, 14, 22, 26, 35, 55, 65, 70, 77, 91, 110, 130, 143, 154, 182, 286, 385, 455, 715, 770, 910, 1001, 1430, 1999, 2002, 3998, 5005, 9995, 10010, 13993, 19990, 21989, 25987, 27986, 43978, 51974, 69965, 109945, 129935, 139930, 153923, 181909, 219890, 259870, 285857, 307846, 363818, 571714, 769615, 909545, 1429285, 1539230, 1819090, 2000999, 2858570, 4001998, 10004995, 20009990]

約数ペア:

[(1, 20009990), (2, 10004995), (5, 4001998), (7, 2858570), (10, 2000999), (11, 1819090), (13, 1539230), (14, 1429285), (22, 909545), (26, 769615), (35, 571714), (55, 363818), (65, 307846), (70, 285857), (77, 259870), (91, 219890), (110, 181909), (130, 153923), (143, 139930), (154, 129935), (182, 109945), (286, 69965), (385, 51974), (455, 43978), (715, 27986), (770, 25987), (910, 21989), (1001, 19990), (1430, 13993), (1999, 10010), (2002, 9995), (3998, 5005)]