21090855

素因数分解:

$3^1\times 5^1\times {\mathrm{19}}^1\times {\mathrm{43}}^1\times {\mathrm{1721}}^1$

素因数の和:1791

約数の個数: 32

約数和(自身を含む): 36368640

約数和(自身を除く): 15277785

約数列:

[1, 3, 5, 15, 19, 43, 57, 95, 129, 215, 285, 645, 817, 1721, 2451, 4085, 5163, 8605, 12255, 25815, 32699, 74003, 98097, 163495, 222009, 370015, 490485, 1110045, 1406057, 4218171, 7030285, 21090855]

約数ペア:

[(1, 21090855), (3, 7030285), (5, 4218171), (15, 1406057), (19, 1110045), (43, 490485), (57, 370015), (95, 222009), (129, 163495), (215, 98097), (285, 74003), (645, 32699), (817, 25815), (1721, 12255), (2451, 8605), (4085, 5163)]