21521253

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{59}}^1\times {\mathrm{199}}^1$

素因数の和:321

約数の個数: 32

約数和(自身を含む): 32256000

約数和(自身を除く): 10734747

約数列:

[1, 3, 13, 39, 47, 59, 141, 177, 199, 597, 611, 767, 1833, 2301, 2587, 2773, 7761, 8319, 9353, 11741, 28059, 35223, 36049, 108147, 121589, 152633, 364767, 457899, 551827, 1655481, 7173751, 21521253]

約数ペア:

[(1, 21521253), (3, 7173751), (13, 1655481), (39, 551827), (47, 457899), (59, 364767), (141, 152633), (177, 121589), (199, 108147), (597, 36049), (611, 35223), (767, 28059), (1833, 11741), (2301, 9353), (2587, 8319), (2773, 7761)]