21985789

素因数分解:

$7^1\times {\mathrm{31}}^1\times {\mathrm{71}}^1\times {\mathrm{1427}}^1$

素因数の和:1536

約数の個数: 16

約数和(自身を含む): 26320896

約数和(自身を除く): 4335107

約数列:

[1, 7, 31, 71, 217, 497, 1427, 2201, 9989, 15407, 44237, 101317, 309659, 709219, 3140827, 21985789]

約数ペア:

[(1, 21985789), (7, 3140827), (31, 709219), (71, 309659), (217, 101317), (497, 44237), (1427, 15407), (2201, 9989)]