81648560

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{211}}^1\times {\mathrm{691}}^1$

素因数の和:922

約数の個数: 80

約数和(自身を含む): 218295552

約数和(自身を除く): 136646992

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 56, 70, 80, 112, 140, 211, 280, 422, 560, 691, 844, 1055, 1382, 1477, 1688, 2110, 2764, 2954, 3376, 3455, 4220, 4837, 5528, 5908, 6910, 7385, 8440, 9674, 11056, 11816, 13820, 14770, 16880, 19348, 23632, 24185, 27640, 29540, 38696, 48370, 55280, 59080, 77392, 96740, 118160, 145801, 193480, 291602, 386960, 583204, 729005, 1020607, 1166408, 1458010, 2041214, 2332816, 2916020, 4082428, 5103035, 5832040, 8164856, 10206070, 11664080, 16329712, 20412140, 40824280, 81648560]

約数ペア:

[(1, 81648560), (2, 40824280), (4, 20412140), (5, 16329712), (7, 11664080), (8, 10206070), (10, 8164856), (14, 5832040), (16, 5103035), (20, 4082428), (28, 2916020), (35, 2332816), (40, 2041214), (56, 1458010), (70, 1166408), (80, 1020607), (112, 729005), (140, 583204), (211, 386960), (280, 291602), (422, 193480), (560, 145801), (691, 118160), (844, 96740), (1055, 77392), (1382, 59080), (1477, 55280), (1688, 48370), (2110, 38696), (2764, 29540), (2954, 27640), (3376, 24185), (3455, 23632), (4220, 19348), (4837, 16880), (5528, 14770), (5908, 13820), (6910, 11816), (7385, 11056), (8440, 9674)]