21391240

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{1327}}^1$

素因数の和:1382

約数の個数: 64

約数和(自身を含む): 53544960

約数和(自身を除く): 32153720

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 31, 40, 52, 62, 65, 104, 124, 130, 155, 248, 260, 310, 403, 520, 620, 806, 1240, 1327, 1612, 2015, 2654, 3224, 4030, 5308, 6635, 8060, 10616, 13270, 16120, 17251, 26540, 34502, 41137, 53080, 69004, 82274, 86255, 138008, 164548, 172510, 205685, 329096, 345020, 411370, 534781, 690040, 822740, 1069562, 1645480, 2139124, 2673905, 4278248, 5347810, 10695620, 21391240]

約数ペア:

[(1, 21391240), (2, 10695620), (4, 5347810), (5, 4278248), (8, 2673905), (10, 2139124), (13, 1645480), (20, 1069562), (26, 822740), (31, 690040), (40, 534781), (52, 411370), (62, 345020), (65, 329096), (104, 205685), (124, 172510), (130, 164548), (155, 138008), (248, 86255), (260, 82274), (310, 69004), (403, 53080), (520, 41137), (620, 34502), (806, 26540), (1240, 17251), (1327, 16120), (1612, 13270), (2015, 10616), (2654, 8060), (3224, 6635), (4030, 5308)]