81275540

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^2\times {\mathrm{11257}}^1$

素因数の和:11304

約数の個数: 36

約数和(自身を含む): 180150516

約数和(自身を除く): 98874976

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 76, 95, 190, 361, 380, 722, 1444, 1805, 3610, 7220, 11257, 22514, 45028, 56285, 112570, 213883, 225140, 427766, 855532, 1069415, 2138830, 4063777, 4277660, 8127554, 16255108, 20318885, 40637770, 81275540]

約数ペア:

[(1, 81275540), (2, 40637770), (4, 20318885), (5, 16255108), (10, 8127554), (19, 4277660), (20, 4063777), (38, 2138830), (76, 1069415), (95, 855532), (190, 427766), (361, 225140), (380, 213883), (722, 112570), (1444, 56285), (1805, 45028), (3610, 22514), (7220, 11257)]