21455440

素因数分解:

$2^4\times 5^1\times {\mathrm{269}}^1\times {\mathrm{997}}^1$

素因数の和:1279

約数の個数: 40

約数和(自身を含む): 50119560

約数和(自身を除く): 28664120

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 269, 538, 997, 1076, 1345, 1994, 2152, 2690, 3988, 4304, 4985, 5380, 7976, 9970, 10760, 15952, 19940, 21520, 39880, 79760, 268193, 536386, 1072772, 1340965, 2145544, 2681930, 4291088, 5363860, 10727720, 21455440]

約数ペア:

[(1, 21455440), (2, 10727720), (4, 5363860), (5, 4291088), (8, 2681930), (10, 2145544), (16, 1340965), (20, 1072772), (40, 536386), (80, 268193), (269, 79760), (538, 39880), (997, 21520), (1076, 19940), (1345, 15952), (1994, 10760), (2152, 9970), (2690, 7976), (3988, 5380), (4304, 4985)]