18516920

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{109}}^1\times {\mathrm{137}}^1$

素因数の和:288

約数の個数: 64

約数和(自身を含む): 43718400

約数和(自身を除く): 25201480

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 109, 124, 137, 155, 218, 248, 274, 310, 436, 545, 548, 620, 685, 872, 1090, 1096, 1240, 1370, 2180, 2740, 3379, 4247, 4360, 5480, 6758, 8494, 13516, 14933, 16895, 16988, 21235, 27032, 29866, 33790, 33976, 42470, 59732, 67580, 74665, 84940, 119464, 135160, 149330, 169880, 298660, 462923, 597320, 925846, 1851692, 2314615, 3703384, 4629230, 9258460, 18516920]

約数ペア:

[(1, 18516920), (2, 9258460), (4, 4629230), (5, 3703384), (8, 2314615), (10, 1851692), (20, 925846), (31, 597320), (40, 462923), (62, 298660), (109, 169880), (124, 149330), (137, 135160), (155, 119464), (218, 84940), (248, 74665), (274, 67580), (310, 59732), (436, 42470), (545, 33976), (548, 33790), (620, 29866), (685, 27032), (872, 21235), (1090, 16988), (1096, 16895), (1240, 14933), (1370, 13516), (2180, 8494), (2740, 6758), (3379, 5480), (4247, 4360)]