21127760

素因数分解:

$2^4\times 5^1\times {\mathrm{79}}^1\times {\mathrm{3343}}^1$

素因数の和:3435

約数の個数: 40

約数和(自身を含む): 49758720

約数和(自身を除く): 28630960

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 79, 80, 158, 316, 395, 632, 790, 1264, 1580, 3160, 3343, 6320, 6686, 13372, 16715, 26744, 33430, 53488, 66860, 133720, 264097, 267440, 528194, 1056388, 1320485, 2112776, 2640970, 4225552, 5281940, 10563880, 21127760]

約数ペア:

[(1, 21127760), (2, 10563880), (4, 5281940), (5, 4225552), (8, 2640970), (10, 2112776), (16, 1320485), (20, 1056388), (40, 528194), (79, 267440), (80, 264097), (158, 133720), (316, 66860), (395, 53488), (632, 33430), (790, 26744), (1264, 16715), (1580, 13372), (3160, 6686), (3343, 6320)]