21009080

素因数分解:

$2^3\times 5^1\times {\mathrm{683}}^1\times {\mathrm{769}}^1$

素因数の和:1463

約数の個数: 32

約数和(自身を含む): 47401200

約数和(自身を除く): 26392120

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 683, 769, 1366, 1538, 2732, 3076, 3415, 3845, 5464, 6152, 6830, 7690, 13660, 15380, 27320, 30760, 525227, 1050454, 2100908, 2626135, 4201816, 5252270, 10504540, 21009080]

約数ペア:

[(1, 21009080), (2, 10504540), (4, 5252270), (5, 4201816), (8, 2626135), (10, 2100908), (20, 1050454), (40, 525227), (683, 30760), (769, 27320), (1366, 15380), (1538, 13660), (2732, 7690), (3076, 6830), (3415, 6152), (3845, 5464)]