21557120

素因数分解:

$2^7\times 5^1\times {\mathrm{13}}^1\times {\mathrm{2591}}^1$

素因数の和:2623

約数の個数: 64

約数和(自身を含む): 55520640

約数和(自身を除く): 33963520

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 40, 52, 64, 65, 80, 104, 128, 130, 160, 208, 260, 320, 416, 520, 640, 832, 1040, 1664, 2080, 2591, 4160, 5182, 8320, 10364, 12955, 20728, 25910, 33683, 41456, 51820, 67366, 82912, 103640, 134732, 165824, 168415, 207280, 269464, 331648, 336830, 414560, 538928, 673660, 829120, 1077856, 1347320, 1658240, 2155712, 2694640, 4311424, 5389280, 10778560, 21557120]

約数ペア:

[(1, 21557120), (2, 10778560), (4, 5389280), (5, 4311424), (8, 2694640), (10, 2155712), (13, 1658240), (16, 1347320), (20, 1077856), (26, 829120), (32, 673660), (40, 538928), (52, 414560), (64, 336830), (65, 331648), (80, 269464), (104, 207280), (128, 168415), (130, 165824), (160, 134732), (208, 103640), (260, 82912), (320, 67366), (416, 51820), (520, 41456), (640, 33683), (832, 25910), (1040, 20728), (1664, 12955), (2080, 10364), (2591, 8320), (4160, 5182)]