21028540

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{2609}}^1$

素因数の和:2662

約数の個数: 48

約数和(自身を含む): 49109760

約数和(自身を除く): 28081220

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, 2609, 4030, 5218, 8060, 10436, 13045, 26090, 33917, 52180, 67834, 80879, 135668, 161758, 169585, 323516, 339170, 404395, 678340, 808790, 1051427, 1617580, 2102854, 4205708, 5257135, 10514270, 21028540]

約数ペア:

[(1, 21028540), (2, 10514270), (4, 5257135), (5, 4205708), (10, 2102854), (13, 1617580), (20, 1051427), (26, 808790), (31, 678340), (52, 404395), (62, 339170), (65, 323516), (124, 169585), (130, 161758), (155, 135668), (260, 80879), (310, 67834), (403, 52180), (620, 33917), (806, 26090), (1612, 13045), (2015, 10436), (2609, 8060), (4030, 5218)]