20817640

素因数分解:

$2^3\times 5^1\times {\mathrm{653}}^1\times {\mathrm{797}}^1$

素因数の和:1461

約数の個数: 32

約数和(自身を含む): 46970280

約数和(自身を除く): 26152640

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 653, 797, 1306, 1594, 2612, 3188, 3265, 3985, 5224, 6376, 6530, 7970, 13060, 15940, 26120, 31880, 520441, 1040882, 2081764, 2602205, 4163528, 5204410, 10408820, 20817640]

約数ペア:

[(1, 20817640), (2, 10408820), (4, 5204410), (5, 4163528), (8, 2602205), (10, 2081764), (20, 1040882), (40, 520441), (653, 31880), (797, 26120), (1306, 15940), (1594, 13060), (2612, 7970), (3188, 6530), (3265, 6376), (3985, 5224)]