20503760

素因数分解:

$2^4\times 5^1\times {\mathrm{197}}^1\times {\mathrm{1301}}^1$

素因数の和:1511

約数の個数: 40

約数和(自身を含む): 47950056

約数和(自身を除く): 27446296

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 197, 394, 788, 985, 1301, 1576, 1970, 2602, 3152, 3940, 5204, 6505, 7880, 10408, 13010, 15760, 20816, 26020, 52040, 104080, 256297, 512594, 1025188, 1281485, 2050376, 2562970, 4100752, 5125940, 10251880, 20503760]

約数ペア:

[(1, 20503760), (2, 10251880), (4, 5125940), (5, 4100752), (8, 2562970), (10, 2050376), (16, 1281485), (20, 1025188), (40, 512594), (80, 256297), (197, 104080), (394, 52040), (788, 26020), (985, 20816), (1301, 15760), (1576, 13010), (1970, 10408), (2602, 7880), (3152, 6505), (3940, 5204)]