21213939

素因数分解:

$3^1\times {\mathrm{53}}^1\times {\mathrm{101}}^1\times {\mathrm{1321}}^1$

素因数の和:1478

約数の個数: 16

約数和(自身を含む): 29126304

約数和(自身を除く): 7912365

約数列:

[1, 3, 53, 101, 159, 303, 1321, 3963, 5353, 16059, 70013, 133421, 210039, 400263, 7071313, 21213939]

約数ペア:

[(1, 21213939), (3, 7071313), (53, 400263), (101, 210039), (159, 133421), (303, 70013), (1321, 16059), (3963, 5353)]