21586840

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{71}}^1\times {\mathrm{691}}^1$

素因数の和:784

約数の個数: 64

約数和(自身を含む): 53809920

約数和(自身を除く): 32223080

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 71, 88, 110, 142, 220, 284, 355, 440, 568, 691, 710, 781, 1382, 1420, 1562, 2764, 2840, 3124, 3455, 3905, 5528, 6248, 6910, 7601, 7810, 13820, 15202, 15620, 27640, 30404, 31240, 38005, 49061, 60808, 76010, 98122, 152020, 196244, 245305, 304040, 392488, 490610, 539671, 981220, 1079342, 1962440, 2158684, 2698355, 4317368, 5396710, 10793420, 21586840]

約数ペア:

[(1, 21586840), (2, 10793420), (4, 5396710), (5, 4317368), (8, 2698355), (10, 2158684), (11, 1962440), (20, 1079342), (22, 981220), (40, 539671), (44, 490610), (55, 392488), (71, 304040), (88, 245305), (110, 196244), (142, 152020), (220, 98122), (284, 76010), (355, 60808), (440, 49061), (568, 38005), (691, 31240), (710, 30404), (781, 27640), (1382, 15620), (1420, 15202), (1562, 13820), (2764, 7810), (2840, 7601), (3124, 6910), (3455, 6248), (3905, 5528)]