20918515

素因数分解:

$5^1\times {\mathrm{73}}^1\times {\mathrm{223}}^1\times {\mathrm{257}}^1$

素因数の和:558

約数の個数: 16

約数和(自身を含む): 25659648

約数和(自身を除く): 4741133

約数列:

[1, 5, 73, 223, 257, 365, 1115, 1285, 16279, 18761, 57311, 81395, 93805, 286555, 4183703, 20918515]

約数ペア:

[(1, 20918515), (5, 4183703), (73, 286555), (223, 93805), (257, 81395), (365, 57311), (1115, 18761), (1285, 16279)]