21288020

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{41}}^1\times {\mathrm{1997}}^1$

素因数の和:2060

約数の個数: 48

約数和(自身を含む): 49342608

約数和(自身を除く): 28054588

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 41, 52, 65, 82, 130, 164, 205, 260, 410, 533, 820, 1066, 1997, 2132, 2665, 3994, 5330, 7988, 9985, 10660, 19970, 25961, 39940, 51922, 81877, 103844, 129805, 163754, 259610, 327508, 409385, 519220, 818770, 1064401, 1637540, 2128802, 4257604, 5322005, 10644010, 21288020]

約数ペア:

[(1, 21288020), (2, 10644010), (4, 5322005), (5, 4257604), (10, 2128802), (13, 1637540), (20, 1064401), (26, 818770), (41, 519220), (52, 409385), (65, 327508), (82, 259610), (130, 163754), (164, 129805), (205, 103844), (260, 81877), (410, 51922), (533, 39940), (820, 25961), (1066, 19970), (1997, 10660), (2132, 9985), (2665, 7988), (3994, 5330)]