20109700

素因数分解:

$2^2\times 5^2\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{499}}^1$

素因数の和:557

約数の個数: 72

約数和(自身を含む): 48608000

約数和(自身を除く): 28498300

約数列:

[1, 2, 4, 5, 10, 13, 20, 25, 26, 31, 50, 52, 62, 65, 100, 124, 130, 155, 260, 310, 325, 403, 499, 620, 650, 775, 806, 998, 1300, 1550, 1612, 1996, 2015, 2495, 3100, 4030, 4990, 6487, 8060, 9980, 10075, 12475, 12974, 15469, 20150, 24950, 25948, 30938, 32435, 40300, 49900, 61876, 64870, 77345, 129740, 154690, 162175, 201097, 309380, 324350, 386725, 402194, 648700, 773450, 804388, 1005485, 1546900, 2010970, 4021940, 5027425, 10054850, 20109700]

約数ペア:

[(1, 20109700), (2, 10054850), (4, 5027425), (5, 4021940), (10, 2010970), (13, 1546900), (20, 1005485), (25, 804388), (26, 773450), (31, 648700), (50, 402194), (52, 386725), (62, 324350), (65, 309380), (100, 201097), (124, 162175), (130, 154690), (155, 129740), (260, 77345), (310, 64870), (325, 61876), (403, 49900), (499, 40300), (620, 32435), (650, 30938), (775, 25948), (806, 24950), (998, 20150), (1300, 15469), (1550, 12974), (1612, 12475), (1996, 10075), (2015, 9980), (2495, 8060), (3100, 6487), (4030, 4990)]