19978515

素因数分解:

$3^3\times 5^1\times {\mathrm{83}}^1\times {\mathrm{1783}}^1$

素因数の和:1880

約数の個数: 32

約数和(自身を含む): 35965440

約数和(自身を除く): 15986925

約数列:

[1, 3, 5, 9, 15, 27, 45, 83, 135, 249, 415, 747, 1245, 1783, 2241, 3735, 5349, 8915, 11205, 16047, 26745, 48141, 80235, 147989, 240705, 443967, 739945, 1331901, 2219835, 3995703, 6659505, 19978515]

約数ペア:

[(1, 19978515), (3, 6659505), (5, 3995703), (9, 2219835), (15, 1331901), (27, 739945), (45, 443967), (83, 240705), (135, 147989), (249, 80235), (415, 48141), (747, 26745), (1245, 16047), (1783, 11205), (2241, 8915), (3735, 5349)]