21378945

素因数分解:

$3^1\times 5^1\times 7^2\times {\mathrm{17}}^1\times {\mathrm{29}}^1\times {\mathrm{59}}^1$

素因数の和:127

約数の個数: 96

約数和(自身を含む): 44323200

約数和(自身を除く): 22944255

約数列:

[1, 3, 5, 7, 15, 17, 21, 29, 35, 49, 51, 59, 85, 87, 105, 119, 145, 147, 177, 203, 245, 255, 295, 357, 413, 435, 493, 595, 609, 735, 833, 885, 1003, 1015, 1239, 1421, 1479, 1711, 1785, 2065, 2465, 2499, 2891, 3009, 3045, 3451, 4165, 4263, 5015, 5133, 6195, 7021, 7105, 7395, 8555, 8673, 10353, 11977, 12495, 14455, 15045, 17255, 21063, 21315, 24157, 25665, 29087, 35105, 35931, 43365, 49147, 51765, 59885, 72471, 83839, 87261, 105315, 120785, 145435, 147441, 179655, 203609, 245735, 251517, 362355, 419195, 436305, 610827, 737205, 1018045, 1257585, 1425263, 3054135, 4275789, 7126315, 21378945]

約数ペア:

[(1, 21378945), (3, 7126315), (5, 4275789), (7, 3054135), (15, 1425263), (17, 1257585), (21, 1018045), (29, 737205), (35, 610827), (49, 436305), (51, 419195), (59, 362355), (85, 251517), (87, 245735), (105, 203609), (119, 179655), (145, 147441), (147, 145435), (177, 120785), (203, 105315), (245, 87261), (255, 83839), (295, 72471), (357, 59885), (413, 51765), (435, 49147), (493, 43365), (595, 35931), (609, 35105), (735, 29087), (833, 25665), (885, 24157), (1003, 21315), (1015, 21063), (1239, 17255), (1421, 15045), (1479, 14455), (1711, 12495), (1785, 11977), (2065, 10353), (2465, 8673), (2499, 8555), (2891, 7395), (3009, 7105), (3045, 7021), (3451, 6195), (4165, 5133), (4263, 5015)]