21049860

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{26987}}^1$

素因数の和:27012

約数の個数: 48

約数和(自身を含む): 63475776

約数和(自身を除く): 42425916

約数列:

[1, 2, 3, 4, 5, 6, 10, 12, 13, 15, 20, 26, 30, 39, 52, 60, 65, 78, 130, 156, 195, 260, 390, 780, 26987, 53974, 80961, 107948, 134935, 161922, 269870, 323844, 350831, 404805, 539740, 701662, 809610, 1052493, 1403324, 1619220, 1754155, 2104986, 3508310, 4209972, 5262465, 7016620, 10524930, 21049860]

約数ペア:

[(1, 21049860), (2, 10524930), (3, 7016620), (4, 5262465), (5, 4209972), (6, 3508310), (10, 2104986), (12, 1754155), (13, 1619220), (15, 1403324), (20, 1052493), (26, 809610), (30, 701662), (39, 539740), (52, 404805), (60, 350831), (65, 323844), (78, 269870), (130, 161922), (156, 134935), (195, 107948), (260, 80961), (390, 53974), (780, 26987)]