20972120

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{1301}}^1$

素因数の和:1356

約数の個数: 64

約数和(自身を含む): 52496640

約数和(自身を除く): 31524520

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, 1301, 1612, 2015, 2602, 3224, 4030, 5204, 6505, 8060, 10408, 13010, 16120, 16913, 26020, 33826, 40331, 52040, 67652, 80662, 84565, 135304, 161324, 169130, 201655, 322648, 338260, 403310, 524303, 676520, 806620, 1048606, 1613240, 2097212, 2621515, 4194424, 5243030, 10486060, 20972120]

約数ペア:

[(1, 20972120), (2, 10486060), (4, 5243030), (5, 4194424), (8, 2621515), (10, 2097212), (13, 1613240), (20, 1048606), (26, 806620), (31, 676520), (40, 524303), (52, 403310), (62, 338260), (65, 322648), (104, 201655), (124, 169130), (130, 161324), (155, 135304), (248, 84565), (260, 80662), (310, 67652), (403, 52040), (520, 40331), (620, 33826), (806, 26020), (1240, 16913), (1301, 16120), (1612, 13010), (2015, 10408), (2602, 8060), (3224, 6505), (4030, 5204)]