18789980

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{223}}^1\times {\mathrm{383}}^1$

素因数の和:626

約数の個数: 48

約数和(自身を含む): 43352064

約数和(自身を除く): 24562084

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 220, 223, 383, 446, 766, 892, 1115, 1532, 1915, 2230, 2453, 3830, 4213, 4460, 4906, 7660, 8426, 9812, 12265, 16852, 21065, 24530, 42130, 49060, 84260, 85409, 170818, 341636, 427045, 854090, 939499, 1708180, 1878998, 3757996, 4697495, 9394990, 18789980]

約数ペア:

[(1, 18789980), (2, 9394990), (4, 4697495), (5, 3757996), (10, 1878998), (11, 1708180), (20, 939499), (22, 854090), (44, 427045), (55, 341636), (110, 170818), (220, 85409), (223, 84260), (383, 49060), (446, 42130), (766, 24530), (892, 21065), (1115, 16852), (1532, 12265), (1915, 9812), (2230, 8426), (2453, 7660), (3830, 4906), (4213, 4460)]