81999560

素因数分解:

$2^3\times 5^1\times {\mathrm{1091}}^1\times {\mathrm{1879}}^1$

素因数の和:2981

約数の個数: 32

約数和(自身を含む): 184766400

約数和(自身を除く): 102766840

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 1091, 1879, 2182, 3758, 4364, 5455, 7516, 8728, 9395, 10910, 15032, 18790, 21820, 37580, 43640, 75160, 2049989, 4099978, 8199956, 10249945, 16399912, 20499890, 40999780, 81999560]

約数ペア:

[(1, 81999560), (2, 40999780), (4, 20499890), (5, 16399912), (8, 10249945), (10, 8199956), (20, 4099978), (40, 2049989), (1091, 75160), (1879, 43640), (2182, 37580), (3758, 21820), (4364, 18790), (5455, 15032), (7516, 10910), (8728, 9395)]