21431540

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{2659}}^1$

素因数の和:2712

約数の個数: 48

約数和(自身を含む): 50050560

約数和(自身を除く): 28619020

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 31, 52, 62, 65, 124, 130, 155, 260, 310, 403, 620, 806, 1612, 2015, 2659, 4030, 5318, 8060, 10636, 13295, 26590, 34567, 53180, 69134, 82429, 138268, 164858, 172835, 329716, 345670, 412145, 691340, 824290, 1071577, 1648580, 2143154, 4286308, 5357885, 10715770, 21431540]

約数ペア:

[(1, 21431540), (2, 10715770), (4, 5357885), (5, 4286308), (10, 2143154), (13, 1648580), (20, 1071577), (26, 824290), (31, 691340), (52, 412145), (62, 345670), (65, 329716), (124, 172835), (130, 164858), (155, 138268), (260, 82429), (310, 69134), (403, 53180), (620, 34567), (806, 26590), (1612, 13295), (2015, 10636), (2659, 8060), (4030, 5318)]