19987175

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{89}}^1\times {\mathrm{691}}^1$

素因数の和:803

約数の個数: 24

約数和(自身を含む): 27029520

約数和(自身を除く): 7042345

約数列:

[1, 5, 13, 25, 65, 89, 325, 445, 691, 1157, 2225, 3455, 5785, 8983, 17275, 28925, 44915, 61499, 224575, 307495, 799487, 1537475, 3997435, 19987175]

約数ペア:

[(1, 19987175), (5, 3997435), (13, 1537475), (25, 799487), (65, 307495), (89, 224575), (325, 61499), (445, 44915), (691, 28925), (1157, 17275), (2225, 8983), (3455, 5785)]