777799990

素因数分解:

$2^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{101}}^1\times {\mathrm{70009}}^1$

素因数の和:70128

約数の個数: 32

約数和(自身を含む): 1542460320

約数和(自身を除く): 764660330

約数列:

[1, 2, 5, 10, 11, 22, 55, 101, 110, 202, 505, 1010, 1111, 2222, 5555, 11110, 70009, 140018, 350045, 700090, 770099, 1540198, 3850495, 7070909, 7700990, 14141818, 35354545, 70709090, 77779999, 155559998, 388899995, 777799990]

約数ペア:

[(1, 777799990), (2, 388899995), (5, 155559998), (10, 77779999), (11, 70709090), (22, 35354545), (55, 14141818), (101, 7700990), (110, 7070909), (202, 3850495), (505, 1540198), (1010, 770099), (1111, 700090), (2222, 350045), (5555, 140018), (11110, 70009)]