81219890

素因数分解:

$2^1\times 5^1\times {\mathrm{1289}}^1\times {\mathrm{6301}}^1$

素因数の和:7597

約数の個数: 16

約数和(自身を含む): 146332440

約数和(自身を除く): 65112550

約数列:

[1, 2, 5, 10, 1289, 2578, 6301, 6445, 12602, 12890, 31505, 63010, 8121989, 16243978, 40609945, 81219890]

約数ペア:

[(1, 81219890), (2, 40609945), (5, 16243978), (10, 8121989), (1289, 63010), (2578, 31505), (6301, 12890), (6445, 12602)]