81977980

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{23}}^1\times {\mathrm{3637}}^1$

素因数の和:3683

約数の個数: 72

約数和(自身を含む): 209024928

約数和(自身を除く): 127046948

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 23, 28, 35, 46, 49, 70, 92, 98, 115, 140, 161, 196, 230, 245, 322, 460, 490, 644, 805, 980, 1127, 1610, 2254, 3220, 3637, 4508, 5635, 7274, 11270, 14548, 18185, 22540, 25459, 36370, 50918, 72740, 83651, 101836, 127295, 167302, 178213, 254590, 334604, 356426, 418255, 509180, 585557, 712852, 836510, 891065, 1171114, 1673020, 1782130, 2342228, 2927785, 3564260, 4098899, 5855570, 8197798, 11711140, 16395596, 20494495, 40988990, 81977980]

約数ペア:

[(1, 81977980), (2, 40988990), (4, 20494495), (5, 16395596), (7, 11711140), (10, 8197798), (14, 5855570), (20, 4098899), (23, 3564260), (28, 2927785), (35, 2342228), (46, 1782130), (49, 1673020), (70, 1171114), (92, 891065), (98, 836510), (115, 712852), (140, 585557), (161, 509180), (196, 418255), (230, 356426), (245, 334604), (322, 254590), (460, 178213), (490, 167302), (644, 127295), (805, 101836), (980, 83651), (1127, 72740), (1610, 50918), (2254, 36370), (3220, 25459), (3637, 22540), (4508, 18185), (5635, 14548), (7274, 11270)]