21391760

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{67}}^1\times {\mathrm{307}}^1$

素因数の和:400

約数の個数: 80

約数和(自身を含む): 54538176

約数和(自身を除く): 33146416

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 67, 80, 104, 130, 134, 208, 260, 268, 307, 335, 520, 536, 614, 670, 871, 1040, 1072, 1228, 1340, 1535, 1742, 2456, 2680, 3070, 3484, 3991, 4355, 4912, 5360, 6140, 6968, 7982, 8710, 12280, 13936, 15964, 17420, 19955, 20569, 24560, 31928, 34840, 39910, 41138, 63856, 69680, 79820, 82276, 102845, 159640, 164552, 205690, 267397, 319280, 329104, 411380, 534794, 822760, 1069588, 1336985, 1645520, 2139176, 2673970, 4278352, 5347940, 10695880, 21391760]

約数ペア:

[(1, 21391760), (2, 10695880), (4, 5347940), (5, 4278352), (8, 2673970), (10, 2139176), (13, 1645520), (16, 1336985), (20, 1069588), (26, 822760), (40, 534794), (52, 411380), (65, 329104), (67, 319280), (80, 267397), (104, 205690), (130, 164552), (134, 159640), (208, 102845), (260, 82276), (268, 79820), (307, 69680), (335, 63856), (520, 41138), (536, 39910), (614, 34840), (670, 31928), (871, 24560), (1040, 20569), (1072, 19955), (1228, 17420), (1340, 15964), (1535, 13936), (1742, 12280), (2456, 8710), (2680, 7982), (3070, 6968), (3484, 6140), (3991, 5360), (4355, 4912)]