19908785

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{43}}^1\times {\mathrm{419}}^1$

素因数の和:497

約数の個数: 32

約数和(自身を含む): 27941760

約数和(自身を除く): 8032975

約数列:

[1, 5, 13, 17, 43, 65, 85, 215, 221, 419, 559, 731, 1105, 2095, 2795, 3655, 5447, 7123, 9503, 18017, 27235, 35615, 47515, 90085, 92599, 234221, 306289, 462995, 1171105, 1531445, 3981757, 19908785]

約数ペア:

[(1, 19908785), (5, 3981757), (13, 1531445), (17, 1171105), (43, 462995), (65, 306289), (85, 234221), (215, 92599), (221, 90085), (419, 47515), (559, 35615), (731, 27235), (1105, 18017), (2095, 9503), (2795, 7123), (3655, 5447)]