21620005

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{1217}}^1$

素因数の和:1269

約数の個数: 32

約数和(自身を含む): 31570560

約数和(自身を除く): 9950555

約数列:

[1, 5, 11, 17, 19, 55, 85, 95, 187, 209, 323, 935, 1045, 1217, 1615, 3553, 6085, 13387, 17765, 20689, 23123, 66935, 103445, 115615, 227579, 254353, 393091, 1137895, 1271765, 1965455, 4324001, 21620005]

約数ペア:

[(1, 21620005), (5, 4324001), (11, 1965455), (17, 1271765), (19, 1137895), (55, 393091), (85, 254353), (95, 227579), (187, 115615), (209, 103445), (323, 66935), (935, 23123), (1045, 20689), (1217, 17765), (1615, 13387), (3553, 6085)]