19958991

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{307}}^1\times {\mathrm{1667}}^1$

素因数の和:1990

約数の個数: 16

約数和(自身を含む): 28769664

約数和(自身を除く): 8810673

約数列:

[1, 3, 13, 39, 307, 921, 1667, 3991, 5001, 11973, 21671, 65013, 511769, 1535307, 6652997, 19958991]

約数ペア:

[(1, 19958991), (3, 6652997), (13, 1535307), (39, 511769), (307, 65013), (921, 21671), (1667, 11973), (3991, 5001)]