20089550

素因数分解:

$2^1\times 5^2\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{997}}^1$

素因数の和:1053

約数の個数: 48

約数和(自身を含む): 41580672

約数和(自身を除く): 21491122

約数列:

[1, 2, 5, 10, 13, 25, 26, 31, 50, 62, 65, 130, 155, 310, 325, 403, 650, 775, 806, 997, 1550, 1994, 2015, 4030, 4985, 9970, 10075, 12961, 20150, 24925, 25922, 30907, 49850, 61814, 64805, 129610, 154535, 309070, 324025, 401791, 648050, 772675, 803582, 1545350, 2008955, 4017910, 10044775, 20089550]

約数ペア:

[(1, 20089550), (2, 10044775), (5, 4017910), (10, 2008955), (13, 1545350), (25, 803582), (26, 772675), (31, 648050), (50, 401791), (62, 324025), (65, 309070), (130, 154535), (155, 129610), (310, 64805), (325, 61814), (403, 49850), (650, 30907), (775, 25922), (806, 24925), (997, 20150), (1550, 12961), (1994, 10075), (2015, 9970), (4030, 4985)]