20928560

素因数分解:

$2^4\times 5^1\times {\mathrm{131}}^1\times {\mathrm{1997}}^1$

素因数の和:2141

約数の個数: 40

約数和(自身を含む): 49054896

約数和(自身を除く): 28126336

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 131, 262, 524, 655, 1048, 1310, 1997, 2096, 2620, 3994, 5240, 7988, 9985, 10480, 15976, 19970, 31952, 39940, 79880, 159760, 261607, 523214, 1046428, 1308035, 2092856, 2616070, 4185712, 5232140, 10464280, 20928560]

約数ペア:

[(1, 20928560), (2, 10464280), (4, 5232140), (5, 4185712), (8, 2616070), (10, 2092856), (16, 1308035), (20, 1046428), (40, 523214), (80, 261607), (131, 159760), (262, 79880), (524, 39940), (655, 31952), (1048, 19970), (1310, 15976), (1997, 10480), (2096, 9985), (2620, 7988), (3994, 5240)]