21268760

素因数分解:

$2^3\times 5^1\times {\mathrm{71}}^1\times {\mathrm{7489}}^1$

素因数の和:7571

約数の個数: 32

約数和(自身を含む): 48535200

約数和(自身を除く): 27266440

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 71, 142, 284, 355, 568, 710, 1420, 2840, 7489, 14978, 29956, 37445, 59912, 74890, 149780, 299560, 531719, 1063438, 2126876, 2658595, 4253752, 5317190, 10634380, 21268760]

約数ペア:

[(1, 21268760), (2, 10634380), (4, 5317190), (5, 4253752), (8, 2658595), (10, 2126876), (20, 1063438), (40, 531719), (71, 299560), (142, 149780), (284, 74890), (355, 59912), (568, 37445), (710, 29956), (1420, 14978), (2840, 7489)]