21542820

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{71}}^1\times {\mathrm{389}}^1$

素因数の和:485

約数の個数: 96

約数和(自身を含む): 66044160

約数和(自身を除く): 44501340

約数列:

[1, 2, 3, 4, 5, 6, 10, 12, 13, 15, 20, 26, 30, 39, 52, 60, 65, 71, 78, 130, 142, 156, 195, 213, 260, 284, 355, 389, 390, 426, 710, 778, 780, 852, 923, 1065, 1167, 1420, 1556, 1846, 1945, 2130, 2334, 2769, 3692, 3890, 4260, 4615, 4668, 5057, 5538, 5835, 7780, 9230, 10114, 11076, 11670, 13845, 15171, 18460, 20228, 23340, 25285, 27619, 27690, 30342, 50570, 55238, 55380, 60684, 75855, 82857, 101140, 110476, 138095, 151710, 165714, 276190, 303420, 331428, 359047, 414285, 552380, 718094, 828570, 1077141, 1436188, 1657140, 1795235, 2154282, 3590470, 4308564, 5385705, 7180940, 10771410, 21542820]

約数ペア:

[(1, 21542820), (2, 10771410), (3, 7180940), (4, 5385705), (5, 4308564), (6, 3590470), (10, 2154282), (12, 1795235), (13, 1657140), (15, 1436188), (20, 1077141), (26, 828570), (30, 718094), (39, 552380), (52, 414285), (60, 359047), (65, 331428), (71, 303420), (78, 276190), (130, 165714), (142, 151710), (156, 138095), (195, 110476), (213, 101140), (260, 82857), (284, 75855), (355, 60684), (389, 55380), (390, 55238), (426, 50570), (710, 30342), (778, 27690), (780, 27619), (852, 25285), (923, 23340), (1065, 20228), (1167, 18460), (1420, 15171), (1556, 13845), (1846, 11670), (1945, 11076), (2130, 10114), (2334, 9230), (2769, 7780), (3692, 5835), (3890, 5538), (4260, 5057), (4615, 4668)]