81620120

素因数分解:

$2^3\times 5^1\times {\mathrm{89}}^1\times {\mathrm{101}}^1\times {\mathrm{227}}^1$

素因数の和:428

約数の個数: 64

約数和(自身を含む): 188373600

約数和(自身を除く): 106753480

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 89, 101, 178, 202, 227, 356, 404, 445, 454, 505, 712, 808, 890, 908, 1010, 1135, 1780, 1816, 2020, 2270, 3560, 4040, 4540, 8989, 9080, 17978, 20203, 22927, 35956, 40406, 44945, 45854, 71912, 80812, 89890, 91708, 101015, 114635, 161624, 179780, 183416, 202030, 229270, 359560, 404060, 458540, 808120, 917080, 2040503, 4081006, 8162012, 10202515, 16324024, 20405030, 40810060, 81620120]

約数ペア:

[(1, 81620120), (2, 40810060), (4, 20405030), (5, 16324024), (8, 10202515), (10, 8162012), (20, 4081006), (40, 2040503), (89, 917080), (101, 808120), (178, 458540), (202, 404060), (227, 359560), (356, 229270), (404, 202030), (445, 183416), (454, 179780), (505, 161624), (712, 114635), (808, 101015), (890, 91708), (908, 89890), (1010, 80812), (1135, 71912), (1780, 45854), (1816, 44945), (2020, 40406), (2270, 35956), (3560, 22927), (4040, 20203), (4540, 17978), (8989, 9080)]