21291258220

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{61}}^1\times {\mathrm{405857}}^1$

素因数の和:405970

約数の個数: 48

約数和(自身を含む): 46501586208

約数和(自身を除く): 25210327988

約数列:

[1, 2, 4, 5, 10, 20, 43, 61, 86, 122, 172, 215, 244, 305, 430, 610, 860, 1220, 2623, 5246, 10492, 13115, 26230, 52460, 405857, 811714, 1623428, 2029285, 4058570, 8117140, 17451851, 24757277, 34903702, 49514554, 69807404, 87259255, 99029108, 123786385, 174518510, 247572770, 349037020, 495145540, 1064562911, 2129125822, 4258251644, 5322814555, 10645629110, 21291258220]

約数ペア:

[(1, 21291258220), (2, 10645629110), (4, 5322814555), (5, 4258251644), (10, 2129125822), (20, 1064562911), (43, 495145540), (61, 349037020), (86, 247572770), (122, 174518510), (172, 123786385), (215, 99029108), (244, 87259255), (305, 69807404), (430, 49514554), (610, 34903702), (860, 24757277), (1220, 17451851), (2623, 8117140), (5246, 4058570), (10492, 2029285), (13115, 1623428), (26230, 811714), (52460, 405857)]